When the war of Conquest ended, the American citizens who remained loyal to Great Britain, also known as the loyalists.
America was no longer a British colony, so the loyalists immigrated to Canada. 36 000 loyalists immigrated to Canada, while 6000 immigrated to Quebec. Consequence, to the English population in Quebec increasing from 1% to 10%. When the Loyalists came it caused a division of Quebec into two colonies, which were called Lower Canada and Upper Canada.