Why did some american volunteers join world war 1 ?

What country aided north korea in the korean war?

What religion influenced the first persian empire as established by cuyrus the great?

How does nafta affect relations between the united states and canada? a. it bans immigration between the two countries. b. it opens the borders between the two countries. c. it raises taxes on trade between the two countries. d. it allows free trade between the two countries.