The correct answer is taxes and bonds.
Taxes on the wealthiest American citizens during World War II helped the American government fund the war. Along with this, the income tax put on all workers helped to fund the government's war effort as well, as unemployment dramatically decreased during WWII.
Along with this, bonds were also bought by American citizens. These bonds gave the government currency immediately and benefited citizens by the government paying them back with interest after the war was over.