Alamosaurus

Behold: America’s largest dinosaur. Alamosaurus was a nearly 100-foot-long titanosaur, a unique group of sauropods set apart for their gargantuan size. These creatures, which include fan favorites like Patagotitan, are the biggest land animals currently known to science.
Correction: We previously misidentified the titanosaur oogenus Megaloolithus as a titanosaur species. Megaloolithus only refers to eggs of that genus.