A few musical genres that originated in the US: ragtime, jazz, gospel, zydeco, rock n roll, rockabilly, country, bluegrass, soul, funk, surf, hip hop.
Sure, many of those have roots in European and African folk traditions, and have had notable contributions from outside, but all of those came into existence in the US, mostly thanks to Black Americans.
A few musical genres that originated in the US: ragtime, jazz, gospel, zydeco, rock n roll, rockabilly, country, bluegrass, soul, funk, surf, hip hop.
Sure, many of those have roots in European and African folk traditions, and have had notable contributions from outside, but all of those came into existence in the US, mostly thanks to Black Americans.