Why did Zachary Taylor anger southerners when he became president in 1849?

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Zachary Taylor angered southerners when he urged Congress to admit California and New Mexico to the Union as free states, as it went against the balance of power between free and slave states that had previously been established by the Missouri Compromise. This move threatened the South's ability to maintain their way of life and their economy based on slave labor.

Why Did Zachary Taylor Anger Southerners When He Became President