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According to the Bureau of Fiscal Services, a unit within the U.S. Department of the Treasury, there is an account called "Gifts to the United States" through which citizens can make general donations to the U.S. government. These contributions are considered unconditional gifts and are for general use by the federal government.
It also looks like the Bureau of Fiscal Services may accept gifts donated to the U.S. government to reduce debt held by the public. Data on these gifts is available back to 1998 through TreasuryDirect, a website of the U.S. Department of the Treasury Bureau of Fiscal Services.