polarize

po|lar|ize /p'oʊləraɪz/ (polarizes polarizing polarized)
in BRIT, also use polarise
[VERB] V n, V
If something polarizes people or if something polarizes, two separate groups are formed with opposite opinions or positions.
Missile deployment did much to further polarize opinion in Britain...
As the car rental industry polarizes, business will go to the bigger companies...
● polarized [ADJ]
Since Independence the electorate has been polarized equally between two parties.
● polarization [N-UNCOUNT]
There is increasing polarization between the blacks and whites in the US.