From Wikipedia
The earliest megatheriid in North America was Eremotherium eomigrans from 2.2 million years ago. With more than five tons in weight, 6 meters in length, and able to reach as high as 17 feet (5.2 m), it was taller than an African Bush Elephant bull. Unlike relatives, this species retained a plesiomorphic extra claw. While other species of Eremotherium had four fingers with only two or three claws, E. eomigrans had five fingers, four of them with claws up to nearly a foot long.
These behemoths even walked in my home state of NC.