The civil rights movement (1896–1954) was a long, primarily nonviolent action to bring full civil rights and equality under the law to all Americans. The era has had a lasting impact on American society – in its tactics, the increased social and legal acceptance of civil rights, and in its exposure of the prevalence and cost of racism.
Two US Supreme Court decisions in particular serve as bookends of the movement: the 1896 ruling of Plessy v Ferguson, which upheld "separate but equal" racial segregation as constitutional doctrine; and 1954's Brown v Board of Education, which overturned Plessy. This was an era of new beginnings, in which some movements, such as Marcus Garvey's Universal Negro Improvement Association, were very successful but left little lasting legacy; while others, such as the NAACP's legal assault on state-sponsored segregation, achieved modest results in its early years, as in, Buchanan v. Warley (1917) (zoning), making some progress but also suffering setbacks, as in Corrigan v. Buckley (1926) (housing), gradually building to key victories, including in Smith v. Allwright (1944) (voting), Shelley v. Kraemer (1948) (housing), Sweatt v. Painter (1950) (schooling) and Brown. In addition, the Scottsboro Boys cases led to a pair of 1935 rulings in Powell v. Alabama, and Norris v. Alabama, that served to make anti-racism jurisprudence more prominent in the context of criminal justice.
Following the civil war, the United States expanded the legal rights of African Americans. Congress passed, and enough states ratified, an amendment ending slavery in 1865 — the 13th amendment to the US constitution. This amendment only outlawed slavery; it provided neither citizenship nor equal rights. In 1868, the 14th amendment was ratified by the states, granting African Americans citizenship, whereby all persons born in the US were extended equal protection under the laws of the constitution. The 15th amendment (ratified in 1870) stated that race could not be used as a condition to deprive men of the ability to vote.