I believe it was the "Europe First" strategy. Hope this helped!
When the North American colonists rebelled against England, they found it necessary to set up a national government. ... The First and Second Continental Congresses fought the Revolutionary War, while the Constitutional Convention created the federal form of government establishing the United States of America.
Divides the powers into Branches - Separation of powers
Divides the power between central and state govern. - Federalism
Each Branch of govern. - Checks and Balances
I think its true, as they had to do the conference of jalta, but im not sure be ause as far as i know Roosevelt was neutral but churchill thought that stalin is a traiter and he cant be trusted and the same way stalin thought about churchill. Also Churchill thought that roosevelt might be a pro-russian so i dont know the right answer to that question but i hope these random information could help you
