What historical event is the best example of domestic policy?

The New Deal, implemented by President Franklin D. Roosevelt in response to the Great Depression during the 1930s, is a prominent example of domestic policy. It comprised a series of programs and reforms aimed at economic recovery, job creation, and social welfare, fundamentally reshaping the relationship between the government and the American economy. The New Deal included initiatives like Social Security, unemployment insurance, and various public works projects, directly addressing domestic economic challenges and impacting millions of Americans.