How does historical scholarship change over time, and why do the perspectives of historians shift? This unit recaps the economic and political events that led to the rise of the West, but examines and re-examines those events through differing opinions of its causes, reflecting changes in historical interpretation.

How do ideas change the world? This unit traces the impact of European Enlightenment ideals in the American and Haitian revolutions and in South America. It also examines the revitalization of Islam expressed in the Wahhabi movement as it spread from the Arabian peninsula to Africa and Asia.

What role has food played in human societies? Studying the production and consumption of food allows historians to uncover hidden levels of meaning in social relationships, understand demographic shifts, and trace cultural exchange. This unit examines the earliest impact of globalization including changing cuisine, environmental impact, and the rise of forced labor as a global economic force.

What is globalization and when did it begin? Before the sixteenth century, the world's four main monetary substances were silver, gold, copper, and shells. But it was China's demand for silver and Spain's newly discovered mines in the Americas that finally created an all-encompassing network of global trade.

What factors shape the ways in which the basic resources are exploited by a society? From Southeast Asia to Russia to Africa and the Americas, the ratios between land availability and the usable labor force were the primary basis of pre-industrial economies, but politics, environment, and culture played a part as well.

What does the study of families and households tell us about our global past? In this episode examining West Asia, Europe, and China, families and households become the focus of historians, providing a window into the private experiences in world societies, and how they sometimes become a model for ordering the outside world.

What are traditions and how are they transmitted? Islamic Spain, Korea, and West Africa provide examples of many different modes of transmission, including oral, written, artistic, and architectural.

What makes an 'empire'? Through the Mongol empire, the Mali empire, and the Inka empire, this unit examines the construction of empires, their administrative structures, legitimating ideologies, and the environmental and technological conditions that shaped them.

How were water routes used as conduits of expansion and trade? The traders of the Indian Ocean, the early Mississippians, and the Norsemen carried death and disease, skills and technologies, philosophies and religion down rivers and across oceans.

How were land-based trade routes conduits of both commerce and culture? The Eurasian Silk Roads, the trans-Saharan Gold Roads, and the Meso-American Turquoise Road trace the transmission of commodities, religions, and diseases, as well as the movements of people.

How do societies assign value to land, labor, and material goods? A comparison of manorial economies in Japan and medieval Europe is contrasted with the tribute economy of the Inka, and the experience of dramatic economic change is illustrated by the commercial revolution in China.

How do religions interact, adopt new ideas, and adapt to diverse cultures? As the missionaries, pilgrims, and converts of Buddhism, Christianity, and Islam moved around the world, the religions created change and were themselves changed.

How do diverse political structures and relationships distribute power and material resources? Through the rise of the Chinese empire, Mayan regional kingdoms, and the complex society of Igbo Ukwu, this unit considers the origins of centralized states and alternative political and social orders.

How did people begin to understand themselves in relation to the natural world and to the unseen realms beyond, and how was religion a community experience? In this unit, animism and shamanism in Shinto are contrasted with philosophical and ethical systems in early Greece and China, and the beginnings of Zoroastrianism, Hinduism, and Judaism.

What do historians know about the earliest farmers and herders, and the evolution of cities? Newly emerging evidence about the 'cradles of civilization' is examined in light of the social, technological, and cultural complexity of recently discovered settlements and cities.

How did the many paths of human migration people the planet? From their origins on the African continent, humans have spread across the globe. This unit explores how and why early humans moved across Africa, Eurasia, and the Americas, based on recent studies in archaeology and linguistics.

How are history and memory different? Topics in this unit range from the celebration of Columbus Day to the demolition of a Korean museum to the historical re-interpretation of Mayan civilization, exploring the ways historians, nations, families, and individuals capture, exploit, and know the past, and the dynamic nature of historical practice and knowledge.

What tools do world historians use in the study of history? This unit begins the study of world history by examining its use of geographical and chronological frameworks: how they have shaped the understanding of world history and been used to chart the past.