#1 – Gang territories #1
The gang territories mechanism is introduced during main story mission Doberman. It is unavailable between main story missions The Green Sabre and Home Coming. Taking over more than 34% of territories (at least 19 of 53) is required to unlock the final main story mission End Of The Line. Between main story missions Home Coming and Los Desperados there are four more territories possible to take over but they don't count.