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Birch Bark.
they were made by the Iroquois. Iroquois canoe was made out of birch-bark and sometimes tree trunks it depends.
i believe they made them out of birch bark from the birch bark tree.
An Iroquois longhouse was made of wood, bark, and mud.
Birch bark
Some of the Algonquian tribes made canoes from hollowed logs - the Powhatan of the Virginia tidewater area certainly did. Many other Algonquian tribes made canoes of birch bark over a timber frame, including the Ojibwe, Maliseet, Cree, Algonkin and Naskapi.Canoes made by the Iroquois tribes were generally of elm bark over a timber frame.
Birch bark tar
Canoe
The Iroquois tribes made twined cornhusk baskets for food storage and transportation. See link below for details, including images:
made baskets out of tree bark and hunted
Birch bark canoes were used as they were naturally available locally. Light to carry, easy to paddle and strong, made the materials used the best choice.
They may have been called cedar bark baskets but they were not made of cedar bark as the cedars are not native to North America. They probably used the bark of Thuja plicata the Western Red Cedar wich is not a true cedar.