The USA

The USA is the country north of Mexico and south of Canada.

America
"The USA" stands for The United States of America.

Similarities
Things America has in common with other countries.

Canada

 * America has 2 A’s, and Canada has 3.

Mexico

 * Both countries have an E, an I, and an M in them.

Both

 * All three are countries in North America.
 * All three have people living in them.
 * All three have the letter C in them.