When was the dominion of Canada founded?

Canada was created by the British North America Act (now the Constitution Act) on July 1, 1867, thereby becoming the first country to be created by legislation.

(Note: The Word "dominion" was never part of Canada's name. It was merely a term of description.)
Canada became a country on July 1, 1867. The term "dominion" is a historical reference to Sec. 3 of the British North America Act which states "one dominion under the name of Canada". Canada was never officially called "The Dominion of Canada".