1865 The 13th amendment abolishing slavery was added to the Constitution. 1868 the 14th amendment conferring citizenship was added to the Constitution. 1870 the 15th amendment barring racial discrimination in voting was added to the Constitution. Regardless of these amendments, from the 1880s into the 1960s many states enforced segregation through “Jim Crow” laws enacted by the states. The most common types of laws forbade intermarriage and ordered business owners and public institutions to keep their black and white customers separated. In the mid 1950s into the 1960s the Civil Rights Movement became very active. Rosa Parks refused to sit in the back of a bus which was followed by a bus boycott by the blacks. Sit-ins were begun at lunch counters where service was denied. Martin Luther King was active in the movement until he was killed in 1968. These activities resulted in the Supreme Court declaring various state laws as being unconstitutional. As a result black students attempted to