The Steilacoom were one of the first peoples affected by colonization in western Washington, as the first trading post, army post, church, and town located north of the
Columbia River were founded inside their territory. In 1849,
Fort Steilacoom was constructed on their land, located about 6 miles north of
Fort Nisqually. In the writings of Hudson's Bay Company factors William F. Tolmie and John McLaughlin, as well as in the writers of the fort's staff, the Steilacoom are mentioned heavily. Later, in 1850, Port Steilacoom was built at their main settlement, and a year later, Steilacoom City was built just upriver. Prior to European contact, the Steilacoom were believed to number around 500. However, their population was decimated by colonization and several vicious smallpox epidemics, together claiming up to two-thirds of their total population. By 1853, their population was reported by Fort Steilacoom officers to be at 175, and by 1854, it had decreased to just 25 individuals. In 1854, the Steilacoom were signatory to the
Treaty of Medicine Creek, under which they ceded their land to the United States in return for a reservation. They did not receive a reservation inside their territory; they were instead instructed to remove to the nearby
Puyallup,
Nisqually, and
Squaxin Island reservations. Following this, many of the remaining Steilacoom families settled on the nearby reservations. Others moved to the
Skokomish and
Port Madison reservations, while some still stayed behind. From 1855 to 1856, during the
Puget Sound War, the Steilacoom were forcibly removed from their territory and placed on
Fox Island by J. V. Weber,
Indian agent. By 1900, just four pockets of the Steilacoom remained off-reservation, at Steilacoom,
DuPont,
Roy, and
Yelm. The leader of the Steilacoom at this time was John Steilacoom, who died shortly later in 1906. His older cousin Joseph McKay became leader following his death, and would later move to the Puyallup Reservation. == Culture and society ==