There was a political and economic crisis in the Soviet Union. All those problems contributed to the unhappiness of the citizens living in it. That contributed to people separating and making their own forms of government, which resulted in the Soviet Union collapse.
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In February 1915, Germany announced unrestricted warfare against all ships, neutral or otherwise, that entered the war zone around Britain. One month later, Germany announced that a German cruiser had sunk the William P. Frye, a private American vessel that was transporting grain to England when it disappeared.
The answer is (d) to prevent politicians from investing in business
One major effect of the passage of the Immigration Act of 1924 was that "<span>D. It reduced immigration from Southern and Eastern Europe," since many Americans were concerned that immigrants were taking their jobs. </span>