Which foreign country touches both montana and idaho?

Though world war 1 and world war 2 have very different conflicts, and circumstances, they also had many simularities. they each fought issues so urgent that every country, felt the need to fight for the side that they had though was right. each country involved had suffered from losses incredibly severe; only in an effort to win.

Ithink it's  a. convince americans to support the war effort by taking certain actions, because propaganda is suppose to influence an audience. sorry if it's wrong, that's what i'm putting on my test.