What where the reasons the soviet union was in such dire economic straits during the later 1980s

Increasing amounts of defense spending.

Explanation:

One of the main reasons why the Soviet Union was in a bad economic situation in the late 1980s was because of the increasing amounts of money that it was spending on defense. A large part of the reason for this was the fact that the United States was also spending a large amount of money on defense, and the Soviet Union felt the need to keep up with it, as part of the legacy of the Cold War.

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on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.