Henry Laurens became the first person to be formally cremated in the U.S. in 1792.

After Laurens died, on December 8, 1792, at his estate, Mepkin, and stated in his will he wished to be cremated, and his ashes be interred at his estate. It’s reported that he was the first formal cremation in United States. Afterward, the estate passed through several hands.

Source