The legislature finds that those articles and properties which illustrate the history of the state of Washington should be maintained and preserved for the use and benefit of the people of the state. It is the purpose of this chapter to designate the two state historical societies as trustees of the state for these purposes, and to establish:
(1) A comprehensive and consistent statewide policy pertaining to archaeology, history, historic preservation, and other historical matters;
(2) Statewide coordination of historical programs; and
(3) A coordinated budget for all state historical agencies.