Both American and Canadian Catholics have claimed her, and sources have called her the first Native American or American Indian saint. This may be true if you limit these terms to the USA and Canada.
As I noted long ago, Juan Diego, the Mexican Indian who first saw the Virgin of Guadalupe, preceded Kateri Tekakwitha. The Catholic Church canonized him in 2002, so I thought he was the indigenous saint.
But I didn't realize other Christian churches also have saints. A blog informed me of another candidate for first indigenous saint:
The Russian River and Saint Peter the Aleut
Peter the Aleut
According to the most fully developed version of the story, in 1815 a group of Russian employees of the Russian American Company and their Aleut seal and otter hunters, including Peter, was captured by Spanish soldiers, while hunting illicitly for seals near San Pedro. According to the original account, the soldiers took them to Misión San Pedro y Pablo for interrogation. One Russian source states that after being taken prisoner near modern Los Angeles, the captives were taken to Mission Dolores—that is, modern San Francisco. With threats of torture, the Roman Catholic priests attempted to force the Aleuts to deny their Orthodox faith and to convert to Roman Catholicism.
When the Aleuts refused, the priest had a toe severed from each of Peter's feet. Peter still refused to renounce his faith and the Spanish priest ordered a group of Native Americans, indigenous to California, to cut off each finger of Peter's hands, one joint at a time, finally removing both his hands. They eventually disemboweled him, making him a martyr to the Eastern Orthodox faith. They were about to torture the next Aleut when orders were received to release them.
According to Yanovsky's 1865 letter, upon receiving the report of Peter's death, St. Herman back on Kodiak Island was moved to cry out, "Holy new-martyr Peter, pray to God for us!"
Peter the Aleut was glorified as a saint by the Russian Orthodox Church Outside Russia and locally glorified by the Diocese of Alaska of the Orthodox Church in America as the "Martyr of San Francisco" in 1980.
Wow, that's the most gruesome case of Christian torture I can remember. It's arguably worse than simply burning someone at the stake.
Note that a Russian ship with Aleut sailors were involved in the Island of the Blue Dolphins story about 35 years later. Strange to think of these people playing a part in California history.
Anyway, I gather the 1980 "glorifications" made Peter a saint. So he preceded Juan Diego by 22 years.
He wasn't an Indian, since "Aleut" falls into the Alaska Native category. And he wasn't a Catholic saint. But he counts as the first indigenous saint of the Americas--that I know of, anyway.
For more on Native saints, see Kateri = Symbol of Colonization and Pope Canonizes Kateri Tekakwitha.