>>63890504
Most NA Injuns also used a common sign language to trade/conduct diplomacy to make up for the fact that they all spoke wildly different languages with completely independent vocabularies. I think there were regional variants used in the PNW and east coast but it was mainly used on the Plains and its peripheries.

The vid below is a 1930s recording of US ret. General Hugh L. Scott who BTFO out of all these guys in the Ghost Dance & Nez Perce wars making them flap their hands around for the vidya camera for posterity:

https://www.youtube.com/watch?v=bfT2a5SGDFA