The delegates of the Constitutional Convention of 1889 approved the original text of the Washington State Constitution. It has been amended 98 times, the last time in Nov. 2006. An earlier constitution ratified by citizens of the Territory in 1878 was never officially adopted.
This research guide provides a brief history of the Washington Constitution and the process by which it can be changed. It serves as a finding aid to the major publications and archival resources concerning the Washington Constitution, including secondary sources, Constitutional Convention documents, and proposed amendments.
See also Gallagher's extensive Washington State Constitution: History website with PDF images of contemporary newspaper articles from the date of the Constitutional Convention, dissertations, and other sources on the Constitution's history and interpretation.