Answer:
what you do is look it up because your on a laptop or phone instead of asking somebody that will probably get it wrong for you ;)
Explanation:l
They used Maginot Line. The Maginot Line was built to fulfill several purposes: To prevent a German surprise attack. ... To push Germany into an effort to circumvent via Switzerland or Belgium, and allow France to fight the next war off French soil to avoid a repeat of 1914–1918. To be used as a basis for a counter-offensive.
Containment was the plan to stop the spread of communism. The U.S was convinced that if one country fell to communism then the surrounding ones would eventually fall to communism. We did our best to control Communism in the east. According to the U.S Countries were either purely democratic or purely communist. there was no in between.
John Brown was seen as a hero
Most countries dont need "justification" for joining a war, typically the only justification is a decision backing up allies, and under this definition, the US was justified, Japan had also initiated aggression againts the US, giving the US an incentive to join the war, so yes, its likely that they were justified in joining the war, for several reasons
