Which action during westward expansion had the most negative impact on the lives of slaves? A. The Fugitive Slave Act
B. The Mexican-American War
C. The Treaty of Washington
D. The Missouri Compromise of 1820

A. The Fugitive Slave Act

Explanation:

A is correct as it allowed slave owners to reclaim runaway slaves.

B is also not correct as after the war California entered Union as a free state and many other state had the opportunity to choose whether they would prohibit slavery.

C is not correct as it ended the slave trade.

D is not correct as according to it slavery was prohibited north of the southern boundary of Missouri.

the correct answer is d) he deserved the title after his leadership in the battle for independence.

agustin de iturbide was a mexican army general and politician. he to win the war of independence from spain. because of that win he was proclaimed emperor of mexico and crowned in 1822, his reign didn’t last long, in 1823 he abdicated and departed for europe, because of that he was declared a traitor and in 1824 he was executed by a firing squad.