What if Britain had received all of New France, (Quebec and Louisiana), in the Seven Years war. With out the French to sell it to the Americans later, woud the territory be a blocker to the US? Even before this how does this effect the war of 1812, or the Revolutionary war?
If Great Britain receives all of New France, I don't think that there would be a USA.
Remember, after the Seven Years' War, Great Britain didn't know where to send all the extra soldiers, so OTL, they just placed them in the colonies. However, with all this new extra territory in Louisiana, the soldiers will likely get placed in Louisiana, to patrol the frontiers and the borders.
Moreover, the colonists now have more room to expand then OTL. While the lands west of the Appellation Mountains will still be out of bounds, aspiring colonists will probably go around to Louisiana and settle there.