As a result of the USA joining the war in 1916, industry production in America shot up. Manufacturers had to keep production up to the pace needed to support the war. In order to produce more material in a little amount of time, new technologies were developed to help manufacturers meet the needs of the government and people. Also more employment opportunities opened for women and African-Americans. However, as the end of the war drew near, and soldiers started to return home, the industry production began to slow, and there was less need for workers in factories. Many women stopped working, but even so there were not enough jobs for the men returning home from Europe. This rising unemployment after a time of industry and economic prosperity, planted the seeds of the coming Great Depression.
Also our national debt went through the roof, in 1915 it went up about $145 million making our total debt $3 billion. Then in 1916 it went up $551 million and grew by $2 billion in 1917! To make matters worse in 1918 it grew by about $8 billion and in 1919 $12 billion. That is insane, our national debt through 1915 to 1919 went from $3 billion to $27 billion. Why couldn't we be like Andrew Jackson who at one point dropped our debt from about $4.7 million to just $33,733.05! Granted he wasn't in one of the biggest wars in world history and that seemed like a ton of money back then but imagine our debt being $33k, that would make our governments lives and our lives so much easier. Then from 1920 to 1925 our debt came down to $20 billion. So the war had a clear effect on our nation and the people living in it.
World War One was a hard war for us even though we were in it for about 2 years. Yet it took us decades to recover, but our conditions were better than all of Europe. But the debt we were in then is nothing compared to what we're in now. We need to find a way to get our economy back on it's feet and lower our national debt, because we don't need a second Great Depression. World War One had many devastating effects on the United States, but the economic effects were tremendous.