The Pine Ridge Indian Reservation is in the southwestern corner of South Dakota and home to the Oglala band of the Lakota tribe.
An 1832 federal law banned the sale of alcohol to Native Americans. The ban ended in 1953 and allowed tribes the option to ban or permit alcohol sales and consumption. Many tribal councils, including Pine Ridge's, decided to exclude alcohol from their reservations.
In the 1970s, Pine Ridge ended prohibition for two months, but then restored the ban. In 2004, an attempt to legalize alcohol also failed.
A majority of voters on Tuesday approved the measure to legalize alcohol, but the outcome was very close. The result was 1,843 for legalization and 1,683 against it, Associated Press reported.