Map of the various sign languages spoken across Turtle Island, excluding Francosign languages. Plains Sign Language is labelled in red as Hand Talk
Plains Indian Sign Language (PISL), also known as Hand Talk, Plains Sign Talk, Plains Sign Language, or First Nation Sign Language, is an endangered sign language common to the majority of Indigenous nations of North America, notably those of the Great Plains, Northeast Woodlands, and the Great Basin. It was, and continues to be, used across what is now central Canada, the central and western United States and northern Mexico. This language was used historically as a lingua franca, notably for international relations, trade, and diplomacy; it is still used for story-telling, oratory, various ceremonies, and by deaf people for ordinary daily use.
In 1885, it was estimated that there were over 110,000 "sign-talking Indians", including Blackfoot, Cheyenne, Sioux, Kiowa, and Arapaho. As a result of the European colonization of the Americas, most notably including American boarding and Canadian residential schools, the number of sign talkers has declined sharply. However, growing interest and preservation work on the language has increased its use and visibility in the 21st century. Historically, some have likened its more formal register, used by men, to Church Latin in function. It is primarily used today by Elders and Deaf citizens of Indigenous nations.

History
Hand Talk's history is intimately associated with both ancient and recent petroglyphs of the continent, however, little is known to academia about Plains Sign Talk's historical antecedents. The earliest records of contact between Europeans and Indigenous peoples of the Gulf Coast region in what is now Texas and northern Mexico note a fully-formed sign language already in use by the time of the Europeans' arrival there. These records include the accounts of Cabeza de Vaca in 1527 and Coronado in 1541.
Signing may have started in the south of North America, perhaps in northern Mexico or Texas, and only spread into the Plains in recent times, though this suspicion may be an artifact of European observation. It is known that there is a complex of Maya sign languages called Meemul Chʼaabʼal or Meemul Tziij in the Kʼicheʼ language, but it is unknown to what extent Meemul Tziij has affected Hand Talk.
The Northwest is home to Plateau Sign Language, which is either a single language or a family of sign languages spoken by the local nations. It is also unknown how associated Plateau Sign Language is with Hand Talk, but it is probable that they are related. Although it is still spoken, especially by the Ktunaxa, the Plateau nations historically shifted to using Chinook Jargon instead
In recent years, the Oneida Nation has taken steps to revive their sign language. Historically, the nations of the Northeast Woodlands, like the Haudenosaunee, spoke a variant of Hand Talk. The Oneida Sign Language Project officially began in 2016, and more signs are being added to this day.
Geography
Sign language use has been documented across speakers of at least 37 spoken languages in twelve families, spread across an area of over 2.6 million square kilometres (1 million square miles). In recent history, it was highly developed among the Crow, Cheyenne, Arapaho and Kiowa, among others, and remains strong among the Crow, Cheyenne and Arapaho.
Melanie R. McKay-Cody, a Cherokee Deaf woman and Hand Talk speaker/researcher, motions that "Plains" Sign Language is actually a family of inter-related languages extending beyond the Great Plains. She breaks down the regional languages as: Northeast Hand Talk (including Oneida Sign Language), Plains Sign Language, Great Basin Sign Language (spoken, for example, by the Ute), and Southwest Hand Talk. She also notes a West Coast language spoken by the Chumash, and she advances the idea that Inuit Sign Language has some relation to this complex of manual North American Indigenous languages. Unmentioned is Coast Salish Sign Language. Within each of these languages, she explains that nations will themselves have specific dialects, such as the Blackfoot.
Southwest Hand Talk is spoken by the Navajo, Hopi, Apache, and Pueblo peoples. However, amongst the Navajo and Keres people, there are two unrelated sign languages also spoken: Keresan Sign Language and, by a Navajo clan with a large number of deaf members, Navajo Family Sign. Likewise, Plateau Sign Language may or may not be related to Hand Talk.
The hidden history of “Hand Talk”
reminders:
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I have browsed /r/Catholicism before. It was largely what inspired me to do more research on the Crusades, since I was surprised to see users praising them while meekly conceding that the Crusaders might have committed an atrocity or two. I was also concerned seeing praise for the Spanish Inquisition, given that its original motivation was anti-Judaism. The anti-Islam misconceptions on that subcommunity did not shock me, but the blatant disregard for Judaism and the widely held belief that all Judaists are going to Hell was baffling.
I am unsure how you still feel about Christianity, but not being an Abrahamist myself, I nevertheless enjoyed reading Jordan Denari Duffner’s Finding Jesus among Muslims: How Loving Islam Makes Me a Better Catholic. It is a welcome break from the Christian perspectives that see Islam as a ridiculously conservative phenomenon that promotes nearly every abuse imaginable, and it is relatively short, too.
CW tradcath stuff
I'm ashamed to admit that seeing the exact same thing as a teen, I wasn't skeptical enough to actually find sources to disprove this kind of revisionism. It was (and to my estimation still is) completely widespread on there. "The Crusades get a bad rap, only the siege of Constantinople was wrong but those guys weren't following the pope's orders." "The inquisition was necessary to stop the spread of heresy, and torture was rare." "The Moorish conquest of Spain was worse than anything Christians ever did in response." Etc. etc. I saw all those historical revisionist lines trotted out routinely, and I didn't have the skills to actually go and find the truth, so I was on a weird, slow version of the alt-right pipeline for a couple of years because of that place. I never really went full tradcath because I knew that there was a very, very huge difference between how I grew up practicing the faith and what the SSPX people are on, and I knew which one I actually prefer.
And yes, your concern is correct IMO, there definitely are a ton of antisemites in that subreddit.
I still am a practicing Catholic! I found liberation theology and dug myself out of the hole. I still have some gripes and some questions about how the Vatican handled Gustavo Gutierrez, the kinda shaky halfway condemnation of socialism and capitalism, separation of Church and State/Potestat and Authoritas, and some other theological points that (at least at first glance) clash with empirical evidence.
I'll add that to my list, I've definitely found that studying Islam and their history has strengthened my appreciation of all faiths.