Final answer:
The events before the Civil War included the Mexican-American War, the Compromise of 1850, and the secession of Southern states.
Step-by-step explanation:
- The Mexican-American War ended with the United States gaining more than 500,000 square miles of Mexican territory.
- Under the Compromise of 1850, California was admitted as a free state, and the territories of Utah and New Mexico were created.
- The Southern states seceded from the Union, leading to the start of the Civil War.
Learn more about Causes of the Civil War