Plz help Which group of historical events had the most to do with abolition?

The Fugitive Slave Act, the Dred Scott decision, and the Kansas-Nebraska Act
The Compromise of 1850, the Mexican-American War, and the Gadsden Purchase
The annexation of California, the Anthony Burns case, and the Harper's Ferry revolt
The Louisiana Purchase, the Missouri Compromise of 1820, and the annexation of Texas

Fugitive slave act, dred Scott decision, and the Kansas Nebraska act

Explanation:

correct me if I'm wrong

a)scientists

explanation:

the national defense education act had two main goals. the first one was to provide personal that was oriented to defense, including scholars, engineering students and so on. the other goal was to provide financial assistance for the students who would be enrolling at colleges and universities in the 1960s.

affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts