C is the answer
There were 5 border states. Each one had slaves, but didn't secede during the civil war.
The Mongol Empire lasted only 100 years.
The Mali Empire lasted a little more than 300 years.
Answer:
Many were Irish immigrants who had come to the United States to escape economic hardship, but found themselves fighting in the Mexican-American War against their adopted country. The American Protestant majority resented the Irish for being of lower socioeconomic status, and also for being Catholic. So they revolted
