This learning resource focuses on the historical analysis of political legitimacy in ancient China, specifically through the lens of the "Mandate of Heaven." It examines a catastrophic environmental event—the flooding of the Yellow River in 1046 BCE during the Shang dynasty—and the resulting crises of authority faced by rulers. Students are tasked with applying the Mandate of Heaven concept to reflect on whether the ruler maintained legitimacy in the aftermath of the disaster. The resource encourages structured reflection through a Claim-Evidence-Reasoning (CER) format, prompting students to analyze the relationship between environmental catastrophe and political legitimacy, along with a challenge that explores the implications of such failures on future governance and infrastructure development.