exogamous

There are several ways to anthropophagy, endogamous (eating your ancestors) and exogamous (eating your enemies).

Because these clans were exogamous, men had to seek wives from neighboring clans.

A jati may be divided into exogamous groups based on the same gotras.

The Chinese, for example, practiced until recently strict exogamous marriage whereby women were always married off outside the clan and men always stayed home.

When the Angle race and the Saxon race became exogamous with respect to each other, their distinction faded and a new Anglo-Saxon race came to be.

Marriage traditionally was arranged, often village exogamous, and also patrilocal.

> adult men trying to find mates, both states will likely have a deficit of womem For Paharis (not Kashmiris), marriage has to be exogamous.

Many small immigrant communities engage in similar behavior, because due to cultural reasons, they tend to marry into the same group, it's only as they integrate into the greater society they become more exogamous.

( This was once way more complicated in stricter days as both Matrilineal and Patrilineal moieties were intertwined across adjacent territorries - leading to a complex system of exogamous out rotation..

>I have seen zero evidence of that in my travels through China The parent comment said: "The Chinese, for example, practiced until recently strict exogamous marriage [...]".

Generally internal instability from internal competition by discontent men, attempts to retain power by trying to "burn off" excess discontent fighting aged men with wars against some sort of external threat/scapegoat, or flat out exogamous raids to seize women - that has been an ancient dubious tradition since at least the bronze age.