Hala is the homeworld of the Kree and the capital planet of the Kree Empire. Hala, the homeworld of the Kree, was for some time at war with Xandar, the base planet of the Nova Corps. In 2014, a peace agreement was reached and rioting broke out throughout the Kree Empire.
Ronan the Accuser, a Kree, decided to ally himself with Thanos so that his world could win the war. To that end, Ronan promised Thanos the Orb in exchange.
Months later, Hala was one of the planets nearly assimilated by Ego, but luckily, the plan was stopped by the Guardians of the Galaxy, ironically the same group of individuals who stopped Ronan from obliterating Xandar.