Answer:
D) the Monroe Doctrine protected the U.S. from involvement in European affairs and W.W. I.
Explanation:
Answer:In the end, Texas was admitted to the United States a slave state. The annexation of Texas contributed to the coming of the Mexican-American War (1846-1848). The conflict started, in part, over a disagreement about which river was Mexico's true northern border: the Nueces or the Rio Grande.
Explanation: