Affecting one faction can potentially ripple through and affect others that are connected. For example, killing a goblin in Gadgetzan will anger the goblins of Ratchet and Booty Bay.

How can I change my reputation?
Complete certain quests
Kill certain monsters
Factions

The Horde and Alliance are each considered a team, and the four races comprising each team are considered factions. The four starting racial factions for each team are displayed under the appropriate team's header.

The factions of the opposing team are always at the lowest reputation level of Hated, and are always locked in the "At War" state.

Players have a bonus to their starting reputation with their own race's faction.

Undead Forsaken players have lower-than-normal starting reputation with their team's Troll, Tauren, and Orc factions.
Troll, Tauren, and Orc players have lower than normal starting reputation with their team's Forsaken faction.
You cannot declare war on any of your own team's factions.
Other Information