Isolated tribes may lack immunity to common diseases, which can kill a large percentage of their people after contact.

These other tribes were even more primitive, and lacked the righting instincts of our Shilluk.

Since the tribe lacked the authority to regulate the sale, Roberts held that the lacked jurisdiction.

She said the tribes lacked the conveyance machines necessary to draw the water to the reservations.

Piegan Blackfeet leaders later credited the mission with giving their tribe well-educated leadership other tribes lacked.

Their own tribe lacked the manpower to colonize the large area.

Under Supreme Court precedent, tribes lack power to prosecute non-Indians.

Certain isolated tribes, such as the Machiguenga of the Amazon, also lack personal names.

All Fuegian tribes had a nomadic lifestyle, and lacked permanent shelters.

Headshakes told that the whole tribe lacked guns.