Malecite–Passamaquoddy (also known as Maliseet–Passamaquoddy) is an endangered Algonquian language spoken by the Maliseet and Passamaquoddy peoples along both sides of the border between Maine in the United States and New Brunswick, Canada. The language consists of two major dialects: Malecite, which is mainly spoken in the Saint John River Valley in New Brunswick; and Passamaquoddy, spoken mostly in the St. Croix River Valley of eastern Maine. However, the two dialects differ only slightly, mainly in accent. The indigenous people widely spoke Malecite-Passamaquoddy in these areas until around the post-World War II era when changes in the education system and increased marriage outside of the speech community caused a large decrease in the number of children who learned or regularly used t