Passed by Congress in the face of President Johnson's veto, the Civil Rights Act of 1866:

A) Forced state courts in the South to practice equality by placing them under the watchful eye of the federal judiciary
B) Guaranteed equality of economic opportunity by barring discrimination in employment on the basis of race
C) Was the first attempt by Congress to desegregate educational facilities in the South
D) Guaranteed the right to vote to all adult males with the equivalent of a third-grade education

The Civil Rights Act of 1866 was primarily aimed at protecting the civil rights of African Americans in the wake of the Civil War. It sought to eliminate racial discrimination in state laws by ensuring that all persons born in the United States, regardless of race, color, or previous condition of servitude, were entitled to the same rights as white citizens. This included the right to make contracts, sue, be parties in court, and enjoy the full protection of federal law. The Act did not specifically address voting rights, education desegregation, or employment discrimination as described in the other options.