The Choctaw donation to Ireland during the Great Famine is well known.
But it turns out that wasn't an isolated incident. Tons of Native Americans and First Nations donated what little they had, and they absolutely did not have to do that. Some truly heartbreaking letters there, lamenting that they can't afford to give any more.
https://www.rte.ie/news/ireland/2025/0317/1502457-canada-ireland-famine/