Each country had a different economic system (capitalism in the USA and communism in the SU), which caused competition.
This competition led to military competition and a nuclear arms race, which was called the Cold War. The nuclear arms race became the greatest point of tension.
Answer:
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2) the end of the Ice Age
When he was about 16 or 15
It began when many women decided its time for a change and equal freedom of opportunities compared to men
