Yes, American soil has been invaded and occupied in the twentieth century.
“In June 1942, the United States launched its first offensive in the Pacific, the Aleutian Campaign. From June 1942 to May 1943 Japan held the Island of Attu. The Battle of Attu took place May 11−30, 1943. With Canadian support, U.S. forces defeated Japanese forces in what was the second deadliest battle in the Pacific Theater. More than 3,000 Japanese and Americans died fighting on Attu. Attu: the Forgotten Battle, a new book by John Haile Cloe, explores that battle and its impact on the island. Aleutian Islands from The U.S. Army Center of Military History provides an overview of the Aleutian Islands Campaign.”
https://www.nps.gov/aleu/planyourvisit/upload/Attu-Forgotten-Battle-Optimized-508.pdf
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