Question

which most accurately describes the reason the korean conflict was the first us war fought by a desegregated army?
the us military had always been desegregated, but the newsreels hid it to maintain political relations with the senators from southern states.
military integration was implemented in 1948 with trumans signing of executive order 9981, but no war flared up until the 1950 korean war.
ending military segregation was a measure designed to show the world that the united states was pursuing a progressive social agenda.
full integration was not implemented in the armed forces until heavy us casualties in korea forced the removal of restrictive racial quotas.

Explanation:

In 1948, President Truman signed Executive Order 9981 which desegregated the US military. The Korean War began in 1950, making it the first war fought by a desegregated US army as there were no wars after the order's signing until then.

Answer:

Military integration was implemented in 1948 with Truman's signing of Executive Order 9981, but no war flared up until the 1950 Korean War.