Answer:
WW1 caused a lot of soldiers to die and also did not bring peace to the world. The Leauge of Nations, that was created after this, made the Treaty of Versaille and only caused more conflict. Finally, WW1 was a huge proponent of disease spreading to more places faster.
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The United States were on the inside of the Berlin wall. The wall separated the West Berlin enclave completely from the rest of the East Berlin and it was surrounded by Soviets completely. The United States helped by having air drops into the city and supporting the locals and the Westernized government that ruled it.
The smaller population states because they get disproportionately higher per capital representation.