What solution preserved the balance in the and would allow slavery to expand into the this plan was known as the?

The solution that preserved the balance between slave and free states while allowing slavery to expand into new territories was the Compromise of 1850. This plan was also known as the Clay Compromise, named after its main proponent, Senator Henry Clay. It included provisions such as admitting California as a free state, allowing popular sovereignty in the territories of New Mexico and Utah, and strengthening the Fugitive Slave Act.