U.S. National Standards
N.NCSS. National Curriculum Standards for Social Studies (NCSS)
NCSS.2. TIME, CONTINUITY, AND CHANGE
SOCIAL STUDIES PROGRAMS SHOULD INCLUDE EXPERIENCES THAT PROVIDE FOR THE STUDY OF THE PAST AND ITS LEGACY.
2.1. KNOWLEDGE - Learners will understand:
2.1.2. Concepts such as: chronology, causality, change, conflict, complexity, multiple perspectives, primary and secondary sources, and cause and effect.