The answer is D. I've done some research.
And 1540s, the Spanish Crown divided the American empire into two immense regions, known as viceroyalties, each ruled by a viceroy appointed by the king. The viceroyalty of New Spain consisted of Mexico, Central America, and the Caribbean islands.
Answer:
Conflict with Mexico began when the United States annexed Texas as a state in 1845.
Mexico claimed that the new border between Texas and Mexico was the Nueces River, while the United States contested the border was the Rio Grande.
Fighting began when a detachment of U.S. cavalry was attacked near the Rio Grande.
Zachary Taylor and Winfield Scott led armies to a series of military successes that culminated in the capture of Mexico City in 1847.
The 1848 Treaty of Guadalupe Hidalgo, forced onto the remnant Mexican government, ended the war and enforced the Mexican Cession of the northern territories of Alta California and Santa Fe de Nuevo México to the United States. The U.S. agreed to pay $15 million compensation for the physical damage of the war and assumed $3.25 million of debt already owed earlier by the Mexican government to U.S. citizens. Mexico acknowledged the loss of what became the State of Texas and accepted the Rio Grande as its northern border with the United States.
Explanation:
Starting a civil war to take power from the senate
