What three countries colonized the united states and canada?

There were more than just 3 countries that colonized the United States and Canada, but there were 3 main ones:

France: France colonized most of what is known as Louisiana, as well as present-day Canada.

Britain: Britain colonized what is known as the Thirteen colonies (Eastern U.S), & acquired Louisiana and present-day Canada after the French & Indian War.

Spain: Spain acquired the western-half of the US, Mexico, and other Central & South American countries.

~

a and b because with the other three, they simplify to something else.