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andreatheshorty
The Department of War became the Department of the Army which was then folded, along with corresponding departments for the other branches, into the Department of Defense.

It used to be that each branch was its own department, with its own cabinet-level secretary. After World War II, the entire security apparatus of the United States was reformed and Congress created an overarching department, the Department of Defense, to run the entire military in an effort to reduce political infighting and operational confusion. Each branch's individual department and secretary all reported to the Secretary of Defense who took over their spots in the Cabinet.
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awise0027

The Department of War was established in 1789 to manage the US military. The department established an official army instead of relying on militias. The National Reorganization Act of 1947 changed this division of the cabinet by creating the Department of Defense. It oversees the nation's military actions. In 2002, the Department of Homeland Security was formed to focus on safety within the nation's borders.

The Department of War originally oversaw the military.

The Department of Defense was created in the late 1940s.

In 2001, the Department of Homeland Security was formed.

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