Why did the us wait to enter world war 2 until 1941

Mike is hosting an outdoor movie screening for his school, and he needs to find out what time the sun is scheduled to set on the date he has in mind. which reference book would be most beneficial to him? a. atlas b. almanac c. thesaurus d. encyclopedia

What happened as agriculture became entrenched in the south ?

What new concept did the the american revolution introduce into the world