Q1. The US got the territory from Mexico after the Mexican-American war. This territory made up the south western United States also known as the Alta California territory. We got the territory after a treaty was signed that ended the war. Q2. American wanted California because at the time a lot of gold was found in this territory. This was one of the leading causes of the gold rush. Q3. The US gained slave states throughout the south. There was more political power in America. We also gained states like Texas, California , Utah and more.
