Which had the biggest effect on civil rights for all united states citizens

It was the "The Black Codes" which were laws in the United States after the Civil War with the effect of limiting the civil rights and civil liberties of blacks.

Explanation:

the united states didn't wanted to get involve with other countries probelms

the u.s. department of labor is a cabinet-level federal agency that supports the american labor force. it has three overall functions. first, it protects the rights of workers and retirees. second, it provides job training. third, it provides statistics related to working, prices, and income.