C. Viking raiders and armed bands threatened everyone, but kings had lost power and could not protect everyone. Under the feudal system, nobles could protect their property and local people by offering land in exchange for loyalty and military service.
Answer:
A. The 1898 Spanish-American War led to world power status for the United States.
Explanation:
The sentence that provides information needed to complete both the cause and effect portions of this diagram is "the 1898 Spanish-American War led to world power status for the United States".
In 1898, there was conflict between Spain and United States. This led to the Spanish-American War and America emerged from the victorious and became world power with great overseas possessions. They took Guam in that 1898 war and it became a U.S territory. Also, during the war, the American troops raised the United States flag in Puerto Rico which formalized U.S control of the colony. The war enabled the United States to help secure independence for Cuba.
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