Final answer:
The Southeastern United States was an independent center for plant domestication, and this is true. The Louisiana Purchase also correctly doubled the territory of the United States, which is true.
Step-by-step explanation:
The statement about a resource group in Azure is unrelated to the historical questions provided, so we will focus on the Southeastern United States as an independent center for plant domestication. It is true that the region of the present-day Southeastern United States was likely one of the world's independent centers for plant domestication. This area, particularly noted for domesticating crops such as squash, sunflower, and goosefoot, was key in developing agriculture independently of other regions around the world.
Additionally, concerning the statement about the Louisiana Purchase, it is also true that the Louisiana Purchase doubled the territory of the United States. This 1803 transaction between the United States and France significantly expanded the nation's area, offering vast tracts of land westward for exploration and development.