hwo do you unlock cars cause i have completed 30% and ive unlocked 2 cars so far

If you go to the world map, then hover your cursor over a star (a race) then a box comes up telling you the details. at the bottom of that box, there's a black box with some words that scroll through, telling you what you unlock if you win the race.

Some single races will unlock cars, but alot of cars are unlocked by gaining control of blocks of territory

thanks for your help