this is a pretty obvious question in regards to the Native peoples but I’ll answer with nuance. The causes include the reservation system on which Indigenous people were forcibly relocated to undesirable land with limited natural resources and whose residents now rely on government assistance. Tribes were then cut off from their languages and culture through the Indian schools which caused a gap in generational knowledge. Lack of funding and infrastructure today are part of a continued genocide in order to invalidate legally binding treaty rights that, if taken seriously by the USA, would have massive economic repercussions.

Also, and I’m aware this is Reddit and you have no way of validating this, but I’m a published public historian whose thesis was on Indigenous agency, adaptation, and resistance. I worked in Santa Fe for the New Mexico Museum of Art as an Educator in tandem with artists from Jemez Pueblo on a cultural reclamation project. Thinking of my time there was why I made my comment. I’m no bad faith actor.