Gain independence from great britain
Answer:
They turned Jewish refugees away because they didn't want to be involved in the war.
The Mexican-American war opened up what is now the American Southwest (Arizona, New Mexico, etc) and most of California to American settlers. Following the end of the war in the mid-1800s, Mexico ceded huge swaths of land in the region which was then opened up to American settlers with California being the most popular destination.
Hey the answer is the constitution hat gives congress the right to make all laws "necessary and proper" to carry out its expressed powers now pls thank me
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