NATO or the North Atlantic Treaty Organization is a military alliance formed in 1949 as a mutual defense treaty of its member countries against external attacks. It was initially formed to counter the military capabilities of the USSR. It currently has 28 member countries from North America and Europe.
The Warsaw Pact was the Soviet Union's response to NATO, and was formed in 1955. It is also a mutual defense agreement among 8 member countries in the Soviet Union and Central and Eastern Europe.
Because there needed to be legislation to rule the new country with. The Constitution was not yet written, and this was what was there instead. After the Articles of Confederation failed, the Constitution was instituted and enforced.
U.S. foreign policy shifted away from "isolationism" to international involvement, since the US started to steer away from Washington's idea that it should remain as detached from foreign issues as possible.
states
People created a WEAK central government back then so that the states could have the majority of the power because they didn't want another ruler ruling over them. The articles of Confederation were made to be a loose aliance between the states, most people felt loyal to their states, and not the country as a whole. The Articles of Confederation did not work out, the Shay's Rebellion made the congress realise that. So, they created the constitutional Convention to amend the constitution, but the delagates ended up creating a whole new Constitution instead, which is the U.S Constitution.
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