Final answer:
Thomas Jefferson believed that white settlers had to purchase land from the natives, reflecting his support for fair treatment of Native Americans.
Step-by-step explanation:
The person who believed that white settlers had no right to land unless they purchased it from the natives was Thomas Jefferson, who was the third President of the United States.
Jefferson believed in the fair and just treatment of Native Americans and recognized their rights to their land. He supported the idea that settlers should negotiate and purchase land from the Native Americans instead of forcefully taking it.
This belief is reflected in Jefferson's policies, such as the Indian Trade and Intercourse Act of 1793, which aimed to regulate interactions between white settlers and Native Americans in regards to land transactions.
Learn more about Thomas Jefferson