1759, British General Wolfe defeated French soldiers on the Plains of Abraham, just outside the walls of Quebec City.
Most of those British soldiers arrived in American ships sailing out of New England ports, so the invasion of Quebec was launched from the 13 Colonies.
Most of their rations and supplies were purchased from New England merchants.
The Battle was not decided until the spring of 1760, when a British convoy was the first to sail up the Saint Lawrence River after the ice broke up.
By then the French had decided that Indian Ocean colonies were far more profitable.
Even after the American Revolutionary War, traditional trade routes still followed the Atlantic seaboard, up past Massachewsetts, New Hampshire and Maine. United Empire Loyalists expected a warm welcome (in Nova Scotia, New Brunswick and PEI) but were disappointed by the poor soil and poor business prospects.
As late as 1800, the British Crown discouraged UEL from settling in southern Quebec's Eastern Townships for fear that immigrants would continue trading with those heathen revolutionaries in New England. One of my (late loyalist) great grandfathers emigrated from New England to Huntingville, Quebec in 1805. Another UEL grandfather emigrated to Lacoll (sp?), Quebec.
When an old friend renovated an old house, he found Boston newspapers dating from 1848 insulating the walls.
Bottom line, Britain was right to fear than American immigrants were too eager to maintain trade ties with their old neighbors in New England. Few late loyalists cared which distant government pretended to rule them.