Final answer:
The best demonstration of Obama's commitment to preserving tribal land is his administration's action in permanently protecting sacred lands and restoring over 428,000 acres of land to Indigenous tribes, reflecting a commitment to tribal sovereignty and land rights.
Step-by-step explanation:
The excerpt that best demonstrates Obama's commitment to preserving tribal land is "Together, we've permanently protected sacred lands for future generations. We've restored more than 428,000 acres of tribal homelands to their original owners." (paragraph 3). This statement directly reflects the actions taken during Obama's administration to preserve and return significant amounts of land to Indigenous tribes, underscoring a commitment to upholding Native American land rights and honoring the importance of these lands to tribal communities.
It's important to note that tribal sovereignty and land repatriation have been key issues in Native American rights, and Obama's tenure saw progress in this area. The protection of sacred lands and the restoration of tribal homelands are indicative of Obama's commitment to positive change in federal policy towards Native American tribes, further supported by engagements such as halting the construction of the Dakota Access Pipeline at Standing Rock and the appointment of key individuals sympathetic to indigenous concerns in his administration.