What decade of the twentieth century did the government begin to take a much larger role in the US economy?

The government began to take a much larger role in the U.S. economy during the 1930s, particularly in response to the Great Depression. This era saw the implementation of the New Deal programs under President Franklin D. Roosevelt, which aimed to provide relief, recovery, and reform to a struggling economy. These initiatives marked a significant expansion of federal involvement in economic matters, laying the groundwork for future government interventions.