There's always more to be said, but in the meantime you may find some answers to your question in this thread about the aftermath of the conquest of Quebec by u/enygma9753.

Quebec had a largely homogenous French Catholic population and began as a commercial enterprise involving the fur trade. After the fall of New France, the British found themselves as masters of 70-80,000 French Catholics and chose a more accommodating method of ruling them by granting them generous civil liberties and property rights unheard of in the rest of the Empire. They had also won over the political and clerical elites, who enjoyed privileges and enhanced status. Protestant New England merchants, who had hoped to enjoy their "rights as Englishmen" and reap the rewards of conquest, instead found a British colonial administration that favoured tolerance. The British were worried about both French rebellion and New England malcontents, but opted to placate the Quebecois and helped to preserve its cultural identity.

Louisiana had French, Creole and Spanish influences throughout its history and had a plantation economy dependent on slaves. Acadian settlers from the Maritime regions of New France were forced into exile during the Seven Years War (French and Indian War) by the British, who wanted to vacate the region for English Protestant settlement. Many exiles moved to Louisiana, contributing much to its cultural identity and evolving into the Cajuns of today. France and Spain had made a secret treaty in 1762 -- the Treaty of Fontainebleau -- which ceded Louisiana territory to Spain after the war. Spain suppressed a rebellion of French settlers between 1767-69, but otherwise didn't actively develop its vast new colony beyond New Orleans and its environs -- they were absentee landlords for the remainder of the 18th century. France briefly reacquired Louisiana in 1801 under Napoleon, but as war in Europe progressed, he needed funds for his campaigns and sold Louisiana in 1803 to the US for 15 million dollars. The US then actively pushed for the anglicization of Louisiana as a state throughout the 19th century.