The section of the Compromise of 1850 that angered the North the MOST and may have actually fueled more tensions between the North and the South was regarding

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10 points
the new Fugitive Slave Law.
the continuation of slavery in Washington D.C.
the support for Popular Sovereignty in the new territories.
the admission of Texas and California to the Union as slave states.

The section of the Compromise of 1850 that angered the North the most and fuelled more tensions between the North and the South was the new Fugitive Slave Law.