I am unaware of any Native American steel or iron weapons predating the arrival of Europeans (16th century). By that time, the majority of Native American technology was stone-age, with the noteable exception of Tlingit copper-working in the Pacific Northwest.
A nice book is Colin F. Taylor's, Native American Weapons, Salamander Books, Ltd., United Kingdom (2001) ISBN 0-8061-3346-5.
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