In this installment of Crash Course European History, John Green explores the dramatic rise of two major European powers during the 17th and 18th centuries: Russia and Brandenburg-Prussia. The video details how these states transformed from relatively minor players into dominant empires through centralized state-building, military expansion, and modernization efforts. It specifically focuses on the reigns of Peter the Great in Russia and the Hohenzollern dynasty in Prussia, highlighting their strategies for consolidating power and the immense social costs associated with their ambitions. Key historical themes include the concept of absolute monarchy, the paradox of modernization, and the relationship between rulers and the ruled. The video examines Peter the Great's westernization of Russia—from the construction of St. Petersburg to the beard tax—and contrasts it with Prussia's unique development as a "large army with a small state attached." It also critically analyzes the institution of serfdom, explaining how noble power over the peasantry was often strengthened in exchange for service to the state, a process known as "re-feudation." This resource is highly valuable for history classrooms as it provides a clear comparative analysis of state-building in Eastern Europe versus Western Europe. It helps students understand the mechanisms of political power, the impact of geography on military strategy, and the human cost of empire-building. The video's engaging narrative and critical questions about the nature of progress and vulnerability make it an excellent tool for sparking discussions about historical ethics and the definition of a "modern" state.