Upvote:4
There is/was the Micmac writing system:
Schmidt and Marshall argued in 1995 that the missionary system of the 17th century was able to serve as a fully functional writing system. This would mean that Miκkmaq is the oldest writing system for a native language north of Mexico.
(and)
Pierre Maillard, Roman Catholic priest, during the winter of 1737β38 created a system of hieroglyphics to transcribe Miκkmaq words.
However, as Barry Fell points out, the Micmac hieroglyphics are very similar, in both form and meaning, to the Egyptian ones (America BC, pp. 255, 256).
And then a little mystery (p. 257):
Maillard died in 1762, 61 years before Champollion published his first decipherment of the Egyptian hieroglyphics.