I believe that there is new government policy in American History because so many new ideas,positions, wars, etc. have appeared that the government need new policies tp know that the people are safe. It practically is necessary because half of these new policies help us from the danger in the real world.
There are many reasons for the government to step in and create policy after policy during the Great Depression. The Great Depression was essentially caused by people buying things with money they didn't have, which in turn made the economy tank and made TONS of people poor and unable to purchase basic necessities. So the government created a the New Deal, which is essentially a ton of programs that allowed younger teenagers to work to help supplement the family, but also to build new infrastructure for roads, highways, dams, etc.. Without the new deal, and all of those policies we would've been unprepared for the upcoming World War 2
