Farming remained the the main economic activity. It moved west with settlement. Inventions, such as cotton gin, encouraged planters to grow even more crops.
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One of the main ways they were similar<span> was in their form of government. Both</span>Athens<span> and </span>Sparta<span> had an Assembly, whose members </span>were<span> elected by the people.</span>Sparta<span> was ruled by two kings, who ruled until they died or </span>were<span> forced out of office.
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Answer:Sinking of American merchant ships
Explanation:In early 1917 Berlin forced the issue. Its declared decision on 31 January 1917 to target neutral shipping in a designated war-zone became the immediate cause of the entry of the United States into the war.