If you can't change lanes, then the distance between you and the car in front of you to encourage a tailgater to go around you

increase

Explanation:

Tailgating means that the car that is behind you is too close and what you can do in this case if you are not able to change lanes is to flash your brake lights and slow down to allow the tailgater to pass you. This means that you increase the distance between you and the car in front of you.

when the united states took over

answer; i believe that the correct answer is ( rivers);