What is the most important reason that Truman had for signing executive order 9881?

To abolish racial discrimination and segregation in the United States military.

Explanation

The most important reason for Executive Order 9981 was desegregation in the United States military. It is an executive order that was made by President Harry S. Truman on July 26, 1948. This order abolished racial segregation in the U. S. military.

The order declared equal treatment and equal opportunity for all persons in the armed services without any consideration to race, color, religion or national origin.

This order led to the end of segregation in the U. S military during the Korean war of 1950 - 1953.