The Espionage Act of 1917 limited freedom of speech. It banned certain newspapers, and magazines who criticized the American government from reporting. Eugene V. Debs was arrested for an antiwar speech, which is something that would not have happened before.
Effects for US Women
Because of WWI, the US government created the War Industries Board, which regulated the distribution of all raw materials, and the price of manufactured goods. Therefore, the production of manufactured goods was controlled by the American government.
Effects for US Immigrants
Many immigrants went to the US during WWI. The American government feared that some of these immigrants supported socialist ideologies. The recent Russian Revolution had had anarchist bombings. As a result of the Russian Revolution, there were strikes in the US, such as the Seattle General Strike, and the Boston Police Strike. Consequently, US government started illegal searches and seizures, unwarranted arrests and detentions, and deportation of those linked with social/communist groups.
Effects for African-Americans
Prior to US involvement in WW1, American women only had the right to vote in a few states. However, the war forced women to assume various roles that men had previously had. Women's patriotic service, and the imprisonment of some women led to the government grant women suffrage.
As a result of WW1, millions of men left to fight the war. Consequently, there were millions of vacant jobs that needed to be occupied. The US government lifted the literacy for Mexicans, so there was a new wave of Mexican immigrants in the US.
Stanford psychologist Lewis Terman began the use of IQ (intelligence quotient). Through the use of intelligence tests, it was believed that were a lot dumber than whites in the US. Therefore, some African Americans were sterilized to prevent the passing of their "worse" genes.