6. Begun by the annexation of Texas by the USA, what was the war between the USA and Mexico called?
From Quiz Foreign Wars of the United States
Answer:
Mexican-American War
In 1835, Texas revolted against Mexican rule. After various battles, Mexico launched a campaign in which Mexican President Santa Anna (Antonio Lopez de Santa Anna) led his army into Texas to crush their army. They captured the Alamo, killing almost all of the garrison, although they suffered many casualties. After chasing the rest of the Texas army led by Samuel Houston, Santa Anna was defeated by the Texans, who gave no quarter, yelling their famous cry, "Remember the Alamo!" This revolt ended in 1836 with the defeat and capture of Santa Anna.
When the USA annexed Texas 12 years later, Mexico declared war in 1848. Two years later, American armies captured Mexico City. Soon after, the Treaty of Guadalupe Hidalgo was signed. In the treaty, Mexico agreed to relinquish all claim to Texas and other states, including New Mexico.
While the Texans did battle with the Mexicans, the question specifically asked for the name of the war between America and Mexico, so the incorrect answers were wrong because they are not only not commonly used (if at all) terms regarding the Texans' struggle, but also did not mention the USA at all.