Which federal government action was authorized by Executive Order 9066 of 1942?

This action was indeed taken during World War II, but it was not authorized by Executive Order 9066. Instead, military tribunals were established under other legal frameworks to address cases involving enemy combatants and espionage, particularly following incidents like the sabotage attempts by Nazi agents.

The United States entered World War II after the attack on Pearl Harbor on December 7, 1941, before Executive Order 9066 was issued in February 1942. The decision to enter the war was motivated by the need to respond to the Axis powers and was not a direct consequence of the executive order in question.

The desegregation of the United States military occurred later, officially in 1948 with President Harry S. Truman's Executive Order 9981. This was a separate civil rights initiative aimed at ending racial discrimination within the armed forces, distinctly different from the wartime internment actions authorized by Executive Order 9066.