* Anti-lynching legislation was not passed, and lynchings continued to occur in the South.
* Racial segregation was institutionalized in the South through Jim Crow laws.
* Blacks were denied the right to vote in many Southern states through poll taxes, literacy tests, and fraud.
* Blacks were subjected to discrimination in employment, housing, and education.
Immigrants
* Emergency Quota Act of 1921: This act severely restricted immigration from Eastern and Southern Europe, which had been the source of most immigration in the years before the war.
* National Origins Act of 1924: This act established a system of national quotas for immigration, based on the population of each country in 1890. This act severely restricted immigration from Asia and Africa, which had been virtually unrestricted before the war.
* Selective Service Act: This act required all men between the ages of 18 and 45 to register for the draft, but exempted immigrants who were not yet citizens.
Political Radicals
* Palmer Raids: These were a series of raids conducted by the Department of Justice in 1919-1920, targeting suspected anarchists and communists. Thousands of people were arrested, many without evidence, and some were deported.
Free Speech:
* Espionage Act of 1917: This act made it a crime to interfere with the draft or to incite rebellion against the government.
* Sedition Act of 1918: This act made it a crime to make false statements about the government.
These restrictions on civil liberties did not end after the war, but they gradually declined in the following years.