The chief purpose of most treaties the U.S. government signed with Native American nations throughout history was to establish agreements regarding land ownership, boundaries, and the relationship between the tribes and the federal government. These treaties aimed to acquire Native American lands for settlement, secure peace, and address conflicts between tribes and settlers. Often, the treaties also obligated the federal government to provide financial compensation, healthcare, education, and other benefits to Native American tribes.
Regarding the Panama Canal, the control of the canal was actually transferred from the U.S. to Panama on December 31, 1999, not in 2000. This transfer was the result of the Torrijos-Carter Treaties signed in 1977 between the United States and Panama. These treaties set the stage for ending the U.S. control over the Panama Canal Zone and granted Panama full sovereignty over the canal, with the transition completed on the specified date in 1999.