What possible reasons explain the growth in the number of executive departments that occurred in the 1900s

Federal administrative agencies have been a critical part of our political process for over 100 years, but their role in our government has changed considerably over that period of time.

When the American republic was young, the executive branch of the government was small. The first agencies of the federal government were the Departments of War, State, Navy, and Treasury. There was also an Office of the Attorney General.

The growth of the country and the expansion of governmental responsibilities led to the creation of the Department of the Interior in 1849, the Department of Justice in 1870, and the Post Office Department in 1872.

the two atomic bombs dropped on japan in 1945 killed and maimed hundreds of thousands of people, and their effects are still being felt today. the uranium bomb detonated over hiroshima on 6 august 1945 had an explosive yield equal to 15,000 tonnes of tnt.