Factionalism (noun)

1. The state of being divided into factions.
2. The practice of supporting a political faction; partisanship.

Origin:

Late 19th century: from french factionnalisme, from factionnel (see factional).

Examples:

1. The civil war was caused by the factionalism among the different ethnic groups.
2. He accused the opposition party of promoting factionalism for their own benefit.
3. The country is still grappling with the aftermath of the factionalism that led to its downfall.
4. The factionalism in the union is preventing it from effectively representing its members.
5. The leadership is trying to put an end to the factionalism that is holding the organization back.