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.
States and the federal government have both exclusive powers and concurrent powers. There is an ongoing negotiation over the balance of power between the two levels.
