They spoke a dialect of the Central Kalapuya language. Some students had completely dropped out before enrolling at Kalapuya. These included the Kalapuya, the Chinook, and the Clackamas. The Willamette Valley was inhabited by the Kalapuya people. Yamhill County was named after the Yamhelas, members of the Kalapuya Tribe. Originally, the area around Woodburn was inhabited by the Kalapuya Native Americans. Some of her spare clothing was bartered with several Kalapuya to acquire buckskin. The first inhabitants to the area were the Kalapuya people. The Kalapuya have intermarried extensively with descendants of their neighboring tribes. Some Chinook and Kalapuya groups saw a 90% reduction in population at this time. Most Kalapuya Indians were removed to the Grand Ronde Agency and reservation. Kalapuya bands typically consisted of extended families of related men, their wives, and children. As was the case for many tribes of the Pacific Northwest, the Kalapuya practiced slavery.