Divisive (adjective)

1. Tending to cause disagreement or hostility between people.
2. Tending to divide a group or organization into opposing factions.
3. Divided or separating into parts.

Origin:

Mid 17th century: from latin divisus, past participle of dividere "divide".

Examples:

1. The issue of immigration has become increasingly divisive.
2. The new policy is divisive and will only serve to further alienate people.
3. The election was divisive and left the country deeply divided.
4. His divisive speech has caused a rift between the two groups.
5. The topic of abortion remains one of the most divisive issues of our time.