How were domestic policies affected by American involvement in World War 1?

There are a
number of ways that US domestic policy changed during WWI. For instance, before they entered
into the war the US was attached to a policy of isolationism, which means that they would focus
their politics internally and avoid interacting with the rest of the world. Their involvement in
the war shifted this dramatically, however, and began the process by which the US would become a
global power.

Also, in 1919, the Supreme Court ruled for the first time, in
the case Schenck v. The United States, that free speech could be legally
forbidden if it presented a "clear and present danger." This case was used to prevent
the distribution of flyers urging people to dodge the draft and has also been used to limit free
speech considerably ever since.