Amajor cause of political polarization in congress is

The correct answer is "gerrymandering."

Gerrymandering is a training planned to set up a political favorable position for a specific gathering or gathering by controlling locale limits. The subsequent locale is known as a gerrymander, however that word is additionally a verb for the procedure. The term gerrymandering has negative implications. Two essential strategies are utilized as a part of gerrymandering: "cracking" and "packing"