Why did the North favor allowing California to enter Union as free state?

Political Balance: The North saw California's admission as a free state as a way to balance the growing number of slave states in the South. With California's entry, the North would gain two more senators and one more representative, strengthening their position in Congress and potentially tipping the balance in their favor.

Strengthening the Union: The North believed that admitting California as a free state would help maintain the unity of the Union. By avoiding the issue of slavery and allowing California to enter as a free state, the North hoped to prevent further secessionist movements and preserve the integrity of the United States.

Economic Interests: Some Northern states, particularly those with strong commercial and shipping interests, saw the potential economic benefits of California's admission as a free state. California's gold rush and its strategic location on the Pacific coast presented opportunities for trade, mining, and economic expansion, which were of interest to Northern merchants and industrialists.

Abolitionist and Antislavery Sentiments: The North had a stronger concentration of abolitionist and antislavery movements compared to the South. Many Northerners saw the admission of California as a free state as a victory for their cause and a step toward the eventual eradication of slavery in the United States.

Wilmot Proviso: The North's support for California's admission as a free state was also influenced by the Wilmot Proviso, which proposed that slavery be prohibited in any territories acquired from the Mexican-American War. The North was largely in favor of the proviso, and admitting California as a free state was seen as a way to enforce this principle.

These factors contributed to the North's support for allowing California to enter the Union as a free state. It was a strategic decision that aimed to maintain political balance, strengthen the Union, advance antislavery goals, and leverage economic opportunities.