...point How did American involvement help the Allies win World
War I?

American involvement helped the Allies win World War I because the American troops are numerous and assumed much of the burden on the battlefield. They fought in many large battles, and quickly learned how to fight on the front.

Explanation:

PLZ MARK :).

the border between arizona and new mexico is a thin, black line; this indicates a state boundary.

its correct: it's a thin line, and it's a state boundary, correct