A City Guide To B„gherh„t for Financing the war. In the United States, the national debt had remained around the $1 billion mark for the 924 World War I previous 30 years. By 1919, the figure would grow to $25 billion, partially because of the $32,080,266,968 that the United States spent on World War I ($9,455,014,125 of this was advanced to Allied countries). Federal spending grew from 1.5 percent of the GROSS NATIONAL PRODUCT (GNP) in 1916 to 24.2 percent of the GNP by 1918. Because of the war, the nation was close to full employment. A City Guide To B„gherh„t 2016.