A. The people were under the ruler's control and had little say in what he requested from them.
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.
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Answer:
D. The introduction of the slave trade to the Atlantic World.
Explanation:
Source 1 presents the beginning of the African slave trade, also known as the transatlantic trade, which allowed that during 1450 to 1750 a large number of African slaves were bought at very low prices and transported to different parts of the world, mainly to the American continent, to be part of the workforce of the farms in European colonies spread across the continent. Most of these slaves came from West Africa and were sold by other Africans, but it was common for Europeans to sail to Africa and capture slaves with their own hands to be sold on the American continent, which was more profitable for the sellers.