How did World War I and its aftermath affect freedom and civil liberties in the United States? For whom?

When the US entered World War I in 1917, President Woodrow Wilson needed to mobilize troops and gain the nation's support very quickly. This included drafting, training, and outfitting millions of young men to prepare them for war duties across the ocean. In order to achieve the country’s backing, the administration launched a major propaganda operation and passed laws to silence dissenters, such as media censorship and the jailing of politicians.
Not surprisingly, some Americans did not appreciate losing their Constitutional right to “civil liberties.” So, the government’s plan to destabilize these civil liberties essentially ended up uniting people, sparking a movement to protect the rights of Americans and their ability to criticize and protest against government programs and decisions, even during wartime situations. One such change was women’s suffrage in America, which culminated with ratification of the 19th Amendment in 1920, a cause spurred on by women who had actively supported safeguarding democracy during World War I.
https://www.archives.gov/education/lessons/woman-suffrage

https://www.encyclopedia.com/defense/energy-government-and-defense-magazines/civil-liberties-world-war-i

The biggest group involved in World War I that saw transformative change in civil liberties were African American veterans. There are widely publicized stories of the African American pilots who showed great courage and valor in their time in the war and then returned home to face great prejudice and inability to find a job or own land.
Because of the widespread prejudice and its juxtaposition against the great deeds these people had done for their country, a campaign began to improve the rights and freedoms of African Americans. During this time, while still imperfect, great strides were made in respect to their equality and rights which vastly improved their lives. This would later be mirrored after World War II by women, who had seen their roles increase beyond the domestic household because of the lack of capable working men in America as a result of the draft and the overall war.