That depends on an arbitrary perception of 'my tribe'. Irish and Italians used to riot against each other. Germans were hated (look up a quote from Benjamin Fra

That depends on an arbitrary perception of 'my tribe'. Irish and Italians used to riot against each other. Germans were hated (look up a quote from Benjamin Franklin). Protestants and Catholics used to riot. Every wave of immigrants seems to get the same treatment by some. Within a few generations, their decendants marry each other.