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"Truman's commitment to civil rights, and perhaps most significantly his desegregation of the armed forces, brought him important political benefits. For one thing, most African Americans who voted supported Truman in 1948. Perhaps most significantly, Truman's desegregation of the armed forces helped offset negative perceptions of the Democratic Party caused by Southern segregationists in Congress and elsewhere, and it helped prevent the Republican Party from regaining its pre-New Deal level of support among African Americans."-Source: Tom Lansford and Richard M. Yon, historians, "Political Pragmatism and Civil Rights Policy," The Civil Rights Legacy of Harry S. Truman, 2007According to the passage, which of the following best explains the most important effect that desegregation of the military had on the United States?

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