Facts

Iroquian - Northern. The languages of individual tribes were closely related and, although not identical, mutually intelligible. The greatest similarities existed between the Mohawk and Oneida and the Cayuga and Seneca.
 * Language:**

Cayuga, Mohawk, Oneida, Onondaga, and Seneca. After 1722 the Tuscarora were added to the League as a sixth, but non-voting, member.
 * Five Sub-Nations:**

Considering their impact on history, it is amazing how few Iroquois there were in 1600 - probably less than 20,000 for all five tribes Their inland location protected them somewhat from the initial European epidemics, but these had reached them by 1650 and, combined with warfare, cut their population to about half of its original number.
 * Population:**