Question

Why do political parties most often try to gerrymander voting districts?

to gain a political advantage
to ensure an equal chance for all candidates
to prove they deserve the voters’ support
to keep each voting district the same shape

Answer 1

To gain a political advantage.

Gerrymandering involves drawing district boundaries to concentrate or dilute certain voters (packing and cracking) so one party wins more seats than its share of the vote would suggest.