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To start the us policy of containment was made because of the fear of communism spreading. An example of containment is when Russia sent nuclear missiles to cuba which in turn created the Cuban missile crisis, the us then set up a "quarantine" around northern cuba to protect the us. Russia later took the missiles back and tensions fell. Another example is the situation in Berlin, West Berlin was communist, East Berlin was democratic, the communist vision eventually fell with the Berlin wall which promoted democracy. The us also gave billons of dollars to Europe to promote democratic growth. The quarantine is basically against communism and promoting a democratic style.
Because people can learn from other people, in both in failures and in successes. The founding fathers of the United States took after the Roman republic in modeling after there government. This is why the United States Congress is structured in the same manner as the Roman Congress. Versus the rectangular or roundtable types of congresses that are seen in European countries.
They also took after the Romans on the idea of a republic being comprised of people elected to represent them. These people are also meant to be changed out on a regular basis. And that the public was in control of who was calling the shots on their behalf.
Unrestricted submarine warfare (on merchant ships) and the sinking of the RMS Lusitania.
