The kansas-nebraska act of 1854 allowed the people in those territories to decide on the issue of slavery for themselves. previously, slavery had been abolished in this area as a result of which legislation?

the indian removal act
the northwest ordinance
the missouri compromise
the compromise of 1850

The best and most correct answer among the choices provided by your question is the third choice which is "Missouri Compromise."

The Missouri Compromise was a United States federal statute devised by Henry Clay. It regulated slavery in the country's western territories by prohibiting the practice in the former Louisiana Territory north of the parallel 36°30′ north, except within the boundaries of the proposed state of Missouri.

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The answer is william henry harrison pursued and defeated british forces retreating into canada.