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by G Richardson · Cited by 11 — The Depression lasted a decade, beginning in 1929 and ending during World War II. Industrial production plummeted. Unemployment soared. Families suffered.
First of all... what period? because if you are talking about this time, I think it is becaise they want to feel powerful to be able to have more allied countries in any situation, they also do it because they want to control most of the world natural sources that other countries have.
In general, World War II greatly aided in the spread of communism because the one of the three main victorious allies was Russia, meaning that much of the post-war landscape was at their disposal.
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The spike in price caused fuel shortages and long lines at gas stations similar to the 1973 oil crisis. ... Iraq's oil production also dropped significantly, triggering economic recessions worldwide. Oil prices did not return to pre-crisis levels until the mid-1980s.