How did muckrakers lead to reform?

The muckrakers' journalism resulted in laws that had a lasting impact, including the end of the Standard Oil monopoly over the oil industry, the establishment of the Pure Food and Drug Act of 1906, and the formation of the first child labor laws in the U.S.

your answer is 1930's

explanation

this is just around the time the great depression was starting and putting the us ecnomy into ecnomic failure causing the goverment to take a much larger rule to try and pieace it back together