A bit of Background taken from reading Marcel Trudel's Deux Siècles d'esclavage au Quebec (2 centuries of slavery in Quebec):
Colonial french canada, unlike other french colonies, never knew chatel slavery and more black slaves entered the territory *after* the conquest then before. The main argument for it's absence has been ascribed by historians to the simple fact that the local economy was not suited to it. The fur trade was done by large companies either dealing with allied native tribes or with what we would nowaday called sole traders. The vast majority of the settlers were farmers who could take care of their own land easily or at least had culture for which large number of hands would not have been viable.
There were calls at various times during the 17th century to organised importation of slaves in the colony*(see note) including in 1689 when the procurator general Ruette D'Auteuil commented on the expensiveness of domestic servants in the colony and came up with an imaginative idea to both protect the slaves from the local weather (many feared africans would simply die when confronted with canadian winter) and recoup some of the money paid for them: they would be dressed in newly flayed and dried beaver furs which they would wear for a while. human sweat and oil would "grease up" the fur, making the longer hair fall off and leaving only a short velvety one. At this stage, the fur was known as "fat beaver" and fetched a price double that of the dry type so that it could be sold and the slave would be issued with new fur to restart the operation. The king gave his assent but the 9 Years War began at that exact moment, disrupting transcontinental commerce. By the end of the war, the king seemed to have cooled down a bit on the idea and in a correspondence with D'auteuil insist that colonists first send garantee of payment before a slaver ship be sent.
It is only when Intendant Begon suggested that slaves could be use for mining (iron mainly) and for hemp farming that the plan was taken seriously again in 1721 after sending a signed petition to buy 101 slaves with a garantee that a load of 200 would easily find buyers. Interestingly, the largest potential buyers appeared to have been religious communities and clergymen. Another interesting aspect of Begon's plan was that slaves would not be limited to domestic and fieldwork but also suggested to train some in more specialised work to raise the number of artisans in the colony and even train some as soldiers to help defend Canada against it's neighbours. The Regent approved the plan which was sent to the (french) Indian Company.
Unfortunatly for this plan, the company at the time was undergoing a reorganisation and in 1724, the company voluntarily let go of its monopoly (except for part of africa) leaving the market open to private contractors. As sending a load of slaves to canada was less profitable then to the antilles, no private slavers appear to have taken the contract and so no large scale importation of black slaves were ever done, the highest number of annual entry before 1760 being 21 but the average being 5 or below. By 1834 with the abolition of slavery throughout the british empire, there were roughly 4200 known slaves in what is now Quebec (or about 0.7 % of the total population) with the native slaves outnumbering the black out by a ratio of about 3 to 1.
Now to the AH fun: Begon sent his original proposal in 1719 but was appointed as intendant in 1710 (though he only set sail in 1712) and Ruette d'auteuil's proposal could have been sent much earlier as he obtain his post in 1680 and was the only son of a previous member of the sovereign council of New France so would have had the necessary prestige to do so. So what if either plans had been sent a little bit earlier ? A first shipment of 200 hundred as planned would in all likelyhood have proven that the market was there if after a few years a slave ship could return to france with a cargo of hemp after dropping off his slaves (carrying fur might have cut into someone's monopoly).
The ramification for the colony would be interesting. Some habitants, mainly older ones, might buy a domestic servants to help them around the house but it's mostly the upper class and religious communities that would have benefited by being able to buy workers to toil their fields (the later were large land owners in colonial time). Assuming that something along the lines of Ruette d'Auteuil's plan was followed, you would also have had a number of slaves becoming tradesmen and soldiers which would diversify the black population and potentialy create some interesting potential sources of conflicts later down the lines.
The arrival of slaves might also have a trickle down effect on french white migration to canada. A larger population would create more demands for certain skills and products so by the time of the seven years war, the population of new france might actualy be far larger then in OTL. While the outcome of the war itself would in all likelyhood not change much, a larger number of militiaman and "janissaires" (for lack of a better word) could prevent the fall of quebec city or Montreal during the 7 years war so that France would be in a slightly better position to negociate the peace treaty.
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*Note: the legality of slavery in New france before 1709 was a bit of a grey area and those identified as slaves arrived as domestic servants with their master or were taken from raids into english colonies. Slavery was not allowed in continental france but was legal in some colonies where "black Codes" were drafted to legislate the practice but canada never received one. A treaty signed between france and england stipulated that slaves fleeing a colony for another would retain their status and be returned *if said colony had slavery* but without a black code, this meant to some that slaves entering canada were freed and could stay (as a few appear to have been). That being said, some official documents register the status of people entering the main quebec hospital (l'hotel-dieu) or of having deceased as "the savage/negro belonging to ...." which would imply slavery (though the wording in french can be taking in a more generalised "linked/related to....."). A royal edict in 1689 even confirmed the right of canadiens to buys slaves though the war prevented the importation of any.
To make matter worst, New France's catechism written by bishop saint-vallier in 1702 stated in one article that a marriage could be annuled if one spouse was found after the ceremony to have been a slave but in another article state that a marriage cannot be annuled for cause of the slave status of one of the spouse as slavery does not exist on this territory. It is believed that the second passage might be an artefact of being copied from the continental french catechism and the contradiction was overlooked before publication.
In 1709, due to a number of incidents were slaves (mostly Panis) had been encouraged to do a runner by local colonists who insisted slavery did not exist in canada, the Intendant Raudot made a proclamation confirming the legality of slavery in the colony. The only real effect afterward was that the transfer of slaves were done in front of a notary.
Colonial french canada, unlike other french colonies, never knew chatel slavery and more black slaves entered the territory *after* the conquest then before. The main argument for it's absence has been ascribed by historians to the simple fact that the local economy was not suited to it. The fur trade was done by large companies either dealing with allied native tribes or with what we would nowaday called sole traders. The vast majority of the settlers were farmers who could take care of their own land easily or at least had culture for which large number of hands would not have been viable.
There were calls at various times during the 17th century to organised importation of slaves in the colony*(see note) including in 1689 when the procurator general Ruette D'Auteuil commented on the expensiveness of domestic servants in the colony and came up with an imaginative idea to both protect the slaves from the local weather (many feared africans would simply die when confronted with canadian winter) and recoup some of the money paid for them: they would be dressed in newly flayed and dried beaver furs which they would wear for a while. human sweat and oil would "grease up" the fur, making the longer hair fall off and leaving only a short velvety one. At this stage, the fur was known as "fat beaver" and fetched a price double that of the dry type so that it could be sold and the slave would be issued with new fur to restart the operation. The king gave his assent but the 9 Years War began at that exact moment, disrupting transcontinental commerce. By the end of the war, the king seemed to have cooled down a bit on the idea and in a correspondence with D'auteuil insist that colonists first send garantee of payment before a slaver ship be sent.
It is only when Intendant Begon suggested that slaves could be use for mining (iron mainly) and for hemp farming that the plan was taken seriously again in 1721 after sending a signed petition to buy 101 slaves with a garantee that a load of 200 would easily find buyers. Interestingly, the largest potential buyers appeared to have been religious communities and clergymen. Another interesting aspect of Begon's plan was that slaves would not be limited to domestic and fieldwork but also suggested to train some in more specialised work to raise the number of artisans in the colony and even train some as soldiers to help defend Canada against it's neighbours. The Regent approved the plan which was sent to the (french) Indian Company.
Unfortunatly for this plan, the company at the time was undergoing a reorganisation and in 1724, the company voluntarily let go of its monopoly (except for part of africa) leaving the market open to private contractors. As sending a load of slaves to canada was less profitable then to the antilles, no private slavers appear to have taken the contract and so no large scale importation of black slaves were ever done, the highest number of annual entry before 1760 being 21 but the average being 5 or below. By 1834 with the abolition of slavery throughout the british empire, there were roughly 4200 known slaves in what is now Quebec (or about 0.7 % of the total population) with the native slaves outnumbering the black out by a ratio of about 3 to 1.
Now to the AH fun: Begon sent his original proposal in 1719 but was appointed as intendant in 1710 (though he only set sail in 1712) and Ruette d'auteuil's proposal could have been sent much earlier as he obtain his post in 1680 and was the only son of a previous member of the sovereign council of New France so would have had the necessary prestige to do so. So what if either plans had been sent a little bit earlier ? A first shipment of 200 hundred as planned would in all likelyhood have proven that the market was there if after a few years a slave ship could return to france with a cargo of hemp after dropping off his slaves (carrying fur might have cut into someone's monopoly).
The ramification for the colony would be interesting. Some habitants, mainly older ones, might buy a domestic servants to help them around the house but it's mostly the upper class and religious communities that would have benefited by being able to buy workers to toil their fields (the later were large land owners in colonial time). Assuming that something along the lines of Ruette d'Auteuil's plan was followed, you would also have had a number of slaves becoming tradesmen and soldiers which would diversify the black population and potentialy create some interesting potential sources of conflicts later down the lines.
The arrival of slaves might also have a trickle down effect on french white migration to canada. A larger population would create more demands for certain skills and products so by the time of the seven years war, the population of new france might actualy be far larger then in OTL. While the outcome of the war itself would in all likelyhood not change much, a larger number of militiaman and "janissaires" (for lack of a better word) could prevent the fall of quebec city or Montreal during the 7 years war so that France would be in a slightly better position to negociate the peace treaty.
----
*Note: the legality of slavery in New france before 1709 was a bit of a grey area and those identified as slaves arrived as domestic servants with their master or were taken from raids into english colonies. Slavery was not allowed in continental france but was legal in some colonies where "black Codes" were drafted to legislate the practice but canada never received one. A treaty signed between france and england stipulated that slaves fleeing a colony for another would retain their status and be returned *if said colony had slavery* but without a black code, this meant to some that slaves entering canada were freed and could stay (as a few appear to have been). That being said, some official documents register the status of people entering the main quebec hospital (l'hotel-dieu) or of having deceased as "the savage/negro belonging to ...." which would imply slavery (though the wording in french can be taking in a more generalised "linked/related to....."). A royal edict in 1689 even confirmed the right of canadiens to buys slaves though the war prevented the importation of any.
To make matter worst, New France's catechism written by bishop saint-vallier in 1702 stated in one article that a marriage could be annuled if one spouse was found after the ceremony to have been a slave but in another article state that a marriage cannot be annuled for cause of the slave status of one of the spouse as slavery does not exist on this territory. It is believed that the second passage might be an artefact of being copied from the continental french catechism and the contradiction was overlooked before publication.
In 1709, due to a number of incidents were slaves (mostly Panis) had been encouraged to do a runner by local colonists who insisted slavery did not exist in canada, the Intendant Raudot made a proclamation confirming the legality of slavery in the colony. The only real effect afterward was that the transfer of slaves were done in front of a notary.