The Don’t Ask Don’t Tell act relates to the theme, Frontiers in History because it kept gay people in the military from being open about their sexuality. This changed a lot of people’s lives because if anybody found out that someone was gay, bisexual, lesbian, etc., that person could potentially be fired. When the act was lifted by Barack Obama in 2010, it finally let people who identify as gay, lesbian, bisexual, etc.to serve openly in the U.S military till this day.