They lost in part because they did not respect the newcomers, or treat them as equals. They did not learn from them, pick up their various tricks and techniques, form marriage and other alliances with them, or organize themselves to establish and enforce political agreements as they would (and had, vs the Cherokee) involving Red people.SAM said:So the Iroquois lost because they did not expect the white men to be different from what they already knew and had seen and were content to leave alone?
The Iroquois did not, for example, in a hundred and fifty years of contact, pick up the custom of domesticating meat animals. They did not learn to read and write. They did not learn anything about ironworking (the raw materials were lying around, ready to hand). They did not learn to build boats suitable for trade and transport across the Great Lakes. They did not learn to weave fabric. They despised White ways as beneath them, White people as useless except as a source for trade goods like steel knives and blankets, without ever respecting the strangers who could produce those blankets.
The new Whites, coming in about 1715, did. They respected the Reds, took them very seriously, learned a lot from them and adopted many of their well-established ways, married and formed other political alliances with them, lived among them child and adult, picked up their languages and politics, and in general established themselves as equals in life on their terms. This lack of tunnel vision proved to be a significant advantage, when push came to shove.