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The US runs monthly surpluses from time to time. This is nothing out of the ordinary. It happens every April, and usually also a few other months of the year. In the last 20 years, the US had monthly surpluses in the month of June in 2006, 2008, 2013, 2014, 2015 and 2016.
https://fred.stlouisfed.org/series/MTSDS133FMS
The monthly deficit in July 2025 was $291B