The document discusses the debate over slavery in California as it sought statehood in the 1840s-1850s. Northern Congressmen opposed the expansion of slavery into new states like California, but Southern Congressmen supported it for economic reasons. California became a free state in 1850 after being admitted to the Union under a Republican administration. Some Southerners then attempted to seize new territories like Cuba and parts of Mexico and Central America to potentially introduce slavery, but these efforts ultimately failed. The debate over slavery in California exacerbated national political tensions in the years leading up to the Civil War.