This site houses the Since Time Immemorial Curriculum: resources, materials, lessons, and entire units that support the teaching of tribal sovereignty, tribal history, and current tribal issues within the context of OSPI-recommended units for Washington and US history in the elementary and middle school levels and US history and Contemporary World Issues in the high school level. Each unit is aligned with National Common Core State Standards and builds toward the successful completion of a Content-Based Assessment, or CBA. Teachers will find that it’s easy to integrate tribal perspectives into their already existing lesson plans.