<span> slavery. They tried to admit states two at a time, one a slave state and one not allowing slavery. </span>
The area became<span> a </span>part of Mexico<span> in 1821 following its successful war for independence, but was ceded to the </span>United States<span> in 1848 after the </span>Mexican–American<span> War. The western </span>portion<span> of Alta </span>California<span> then was organized and admitted as the 31st </span>state<span> on September 9, 1850.</span>
My friend I think this is D