In the years 1917 to 1919, US participation in World War I and anarchist bombings after the war led to almost two thousand federal prosecutions, mass roundups of aliens, and summary deportations. During World War II, Japan’s attack on the US was followed by the internment of more than 120,000 Japanese-Americans because of their race, including many who were born in the US.
在二十世纪中，有四个阶段对公民自由的侵犯尤其严重。1917年到1919年之间，美国参加第一次世界大战以及战后无政府主义者炸弹攻击后，导致将近两千起联邦起诉、大规模搜捕外国人以及迅速遣返。二战期间，日本进攻美国后，超过12万日裔美国人由于他们的种族而遭到关押，其中包括许多出生在美国的人。