Answer:
The answer is b
Explanation:
Federalism is the system of government in which sovereignty is constitutionally divided between a central governing authority and constituent political units.
Absolutely not because this would mean we'd not work with International countries and many other things. Look up the definition of Isolationism and come up with your own answer in your own words because it's asking you to provide your own opinion
Answer:
The Gadsden Purchase
Explanation:
It later became part of New Mexico and Arizona