A thousand velociraptors would be massacred as well.
we also hunted wolves to extinction in the 1800s. you really think any dinos would be a problem with todays arms, and helocopters, planes, etc?
the US has wolves, lions, bears, and boar. you think the hunters here don't know a thing or two about game fighting back? Hell, even shit like moose, bison, elk, etc are actually super dangerous 1v1.
places dinos would be a problem. first, not the USA. places without a shit ton of guns. and places with large amounts of wilderness. amazon, etc. places that don't have winters, which large reptiles would get recked in.
Dinos are only an issue in movies, because they obey movie slasher rules. teleport around, no one has any peripheral vision, and guns only work within 20ft.