Southerners also had to swear an oath to follow laws that dealt with what issue?

The 15th Amendment, which sought to protect the voting rights of African American men after the Civil War, was adopted into the U.S. Constitution in 1870. Despite the amendment, by the late 1870s discriminatory practices were used to prevent Black citizens from exercising their right to vote, especially in the South.

operation overlord was the codename for the battle of normandy, the allied operation that launched the successful invasion of german-occupied western europe during world war ii. the operation was launched on 6 june 1944 with the normandy landings