Not sure what wat you refer to...but after WWI the US saw themselves in the Great Depression due to self economic dispute and the the deal to fund Germany which would pay back France and Britain. After WWII they almost immediately entered the Cold War with the Soviet Union.
The senate makes the rules and not the president. The president can propose a rule but the senate must agree upon the Presiden't proposition
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Colonists lost respect for Britain's military, British didn't treat colonists with proper respect. (colonists began to see themselves as different from british
The Great Depression came to end during world war 2