Answer:
The person who would have been most likely to support the March on Washington Movement in the 1940s would be a civil rights activist or someone who believed in equal rights for African Americans. The March on Washington Movement was a campaign led by A. Philip Randolph and other civil rights leaders to protest racial discrimination in employment practices by the U.S. government and defense industries during World War II. It aimed to achieve fair treatment and equal job opportunities for African Americans. Individuals passionate about civil rights, equality, and social justice would have been most likely to support and participate in the March on Washington Movement during that time.