An 18th Century Cemetery

In 2011, an archaeologist named Ryan Gray uncovered a burial site at the French Quarter during a test dig for a pool installation at Vincent Marcello’s residence. The remains were part of the St. Peter Cemetery in New Orleans, where other skeletons were found in the 80s. Gray excavated all the coffins and transported them to Louisiana State University for further examination.
I'm wondering, if s/o writes:
"Faaaake - how can it be?
The US exist since 1776-07-04 ! Nothing can be before!
Don't be a woke leftist, do your own research, touch some grass and never trust science or the universities!"
Bomb! What the fuck?