The early 1900s in the United States saw rapid increases in economic growth due to the invention of electricity, the growth of the automobile industry, and other advancements which caused the government to increase its role in the economy. What are ways the government became more involved?

A. Laws were passed to ensure public safety, and the federal income tax system was established.
B. The government began to spend money on veterans pensions and building railroads.
C. The Social Security system was established.
D. The government focused on building up the world's largest military