(HC)The table below shows the unemployment rate in the United States from 1918 through 1921: Year Unemployment Rate 1918 1.4
1919 1.4
1920 5.2
1921 11.7
Which factor explains the trend shown in the table?

economic competition from Europe after World War I
demobilization of U. S. soldiers after World War I
a spike in immigration to the United States after World War I
a sudden dropoff in government spending after World War I