During Truman's presidency, which action advanced liberal domestic policies?

The action that advanced liberal domestic policies during Truman's presidency is the executive order ending racial discrimination in the military. This executive order, issued in 1948, was a pivotal moment in the fight for civil rights, as it marked the first significant step toward desegregating the armed forces. By promoting equality and addressing racial discrimination, the order aligned with the broader liberal agenda of promoting civil rights and fostering social justice. This move also set a precedent for further civil rights advancements in society.

The establishment of the Social Security Administration played a critical role in social welfare but was created prior to Truman's presidency and is not attributed to his administration's direct actions. The implementation of federal job programs did occur under his presidency but was less impactful in terms of advancing the liberal domestic agenda compared to the focus on civil rights. While support for labor strikes and unions was an important aspect of Truman’s policies, it was more aligned with economic issues and labor rights, not specifically a direct advancement of liberal domestic policies in the context of racial equality.