A more thorough explanation:

The cash-and-carry clause was a regulation in international law that allowed countries at war to purchase goods with cash, even if the export of those goods was prohibited. This regulation was in effect before the United States entered World War II.

For example, during the early years of the war, Great Britain was in desperate need of supplies, including weapons and ammunition. The cash-and-carry clause allowed them to purchase these goods from the United States, even though the U.S. was officially neutral in the conflict.

However, the cash-and-carry clause was not entirely neutral in practice. Great Britain had a stronger navy than Germany, which meant that they were better able to transport goods across the Atlantic. This gave them an advantage in purchasing supplies from the U.S. under the cash-and-carry clause.

Overall, the cash-and-carry clause was a way for the U.S. to remain neutral in the early years of World War II while still providing support to its allies.