Fishing has been recognized as a valuable resource on the Pacific coast since First Nations tribes arrived in the area. Fish were used in trade with other tribes, and so were of political importance. The fishery also had deep cultural importance to First Nations people, and from 1855 to 1860, several tribes signed treaties with the state of Washington to reserve fishing rights. The US government still upholds these treaties today. Since that time, there have been other treaties between the US or Canada and its First Nations people, as well as treaties between the two countries. Management practices of Pacific and Atlantic fisheries diverged early in the history of North American commercial fisheries. The Pacific coast fisheries have been more tightly managed through international agreements and negotiations. Today, the two most important groups addressing Pacific fishery issues between Canada and the US are the International Pacific Halibut Commission (IPHC) and the Pacific Salmon Commission (PSC).