Lets abolish every single Native American reservation that exists. My reasons for this are:
1: It expands US territory
2: It increases the GDP of the US
3: It increases the GDP per capita of individual Native Americans due to more investment, a replacement of their current culture with a more capitalist American culture, and due to private American investment.
4: Due to this GDP per capita increase, the infant morality rate would decrease. The average Native baby has a significantly higher chance of dying from infant mortality then the average non Hispanic White baby(https://minorityhealth.hhs.gov/omh/browse.aspx?lvl=4&lvlid=38). If the US annexed the reservations and eliminated the cultural differences in these regions (not by force, but by Americans inevitably moving there and therefore dwindling the culture), then Native lives would be saved.