Writing in 1845 Friedrich Engels (and with him many other informed contemporaries) had few hesitations in pointing out the driving forces of the epochal transformation he was witnessing:

The history of the proletariat in England begins with the second half of the last century, with the invention of the steam engine and the machinery for working cotton. These inventions gave rise, as is well known to an industrial revolution, a revolution which altered the whole civil society; one, the historical importance of which is only now beginning to be recognized.

The relocation of Europeans across the North Atlantic during the first decade and a half of the twentieth century was the culmination of the longest-lived and most widely documented transoceanic migration of modern times. This enormous population transfer was a great human drama, a major international demographic shift, and a massive historical experiment in cultural transformation during a period of unprecedented globalization. This migration was also a complex and powerful travel business containing both risks and rewards for its three fundamental participants: the movers, the moved, and the sovereign authorities on either side of the borders being traversed. Prior studies have not adequately explained this business nor appreciated the extent to which the various strategies for dealing with its associated risks were crucial, largely congruent, and self-reinforcing elements of the overall migration process.

The integration of women into formal labor markets was one of the most salient changes of the twentieth century. The “female century,” in the words of The Economist, witnessed an extraordinary transformation of women's opportunities and outcomes both in and outside the household. My dissertation explores both the causes and the consequences of women's move from home to market in the United States during three episodes of rapid change. It begins by documenting demand-side shifts during the 1940s that increased the earnings and occupational choices of African-American women; then demonstrates the impact of contraceptive technology on the extent and intensity of women's participation in the formal labor market after 1960; and, finally, estimates the consequences of shifts in women's labor supply for the growth of earnings inequality in the United States during the 1980s.

This dissertation argues that the federal government played an essential role in the shaping of the western economy. American expansion necessitated not only that land be opened up, but also that the regional economy be reorganized. Specifically, the federal government did so in three ways. First, the military wrested control of the western economy from the tribes of the Northwest Territory through warfare, both during the Indian wars of the 1790s and later during the War of 1812. Second, the federal government sponsored the construction of roads throughout the region. Finally, colonial agencies of the federal government attempted to transform the Native American economy from one focused on fur trading to one centered on sedentary commercial agriculture.

Technological progress has long been widely recognized as a crucial source of economic growth. Many countries have, accordingly, devoted considerable resources to promote more rapid generation and diffusion of technology in their economies. Yet recent studies reveal a persistence of stark contrasts across countries and geographic space more generally, not only in productivity, but also in the generation of new technological knowledge. What accounts for these geographic disparities is not well understood.