Final answer:
The Southeastern United States was an independent center for plant domestication, where early cultivation of crops like sunflower and squash took place.
Step-by-step explanation:
The statement that the region of the present-day Southeastern United States was likely one of the world's independent centers for plant domestication is TRUE. This area is known to have been a site of early plant cultivation, where indigenous peoples domesticated crops such as sunflower, squash, and goosefoot, independent of developments in other regions such as Mesoamerica or the Andes.