Final answer:
The President, Congress, the Treasury Department, and the Federal Reserve played key roles in stabilizing the economy after the 2008 crisis by implementing programs, injecting cash into troubled banks, and lowering interest rates.
Step-by-step explanation:
The major parts of the federal government that played a significant role in stabilizing the economy after the 2008 economic crisis were the President, Congress, the Treasury Department, and the Federal Reserve.
The President and Congress implemented various programs like tax rebates and the Troubled Asset Relief Program (TARP) to stimulate household consumption and encourage investment. The Treasury Department played a crucial role in injecting cash into troubled banks and supporting automobile companies facing bankruptcy. The Federal Reserve lowered short-term interest rates and injected money into the banking system, increasing funds available for lending to businesses and consumers.
This collective effort of different branches of the federal government helped lessen the impact of the economic downturn and prevent a second Great Depression.