1 Despite the circumstances under which the first waves of Vietnamese left the country, Vietnamese refugees kept contact with families and friends in Vietnam. As Zhou writing in (Rumbaut and Portes, 2001, p. 190) writes, 'Letters frequently moved between the receiving countries and Vietnam'. Moreover the first companies that established long-distance telephone and flight services to Vietnam after 1994, which drastically reduced information barriers between the two countries, were founded by Vietnamese migrants.

The fragmentation of production chains across borders is one of the most distinctive feature of the last 30 years of globalization. Nonetheless, our understanding of its implications for trade theory and policy is only in its infancy. We suggest that trade in value added should follow theories of comparative advantage more closely than gross trade, as value-added flows capture where factors of production, e.g. skilled and unskilled labor, are used along the global value chain. We find empirical evidence that Heckscher-Ohlin theory does predict manufacturing trade in value-added, and it does so better than for gross shipment flows. While countries exports across a broad range of sectors, they contribute more value-added in techniques using their abundant factor intensively. JEL CODES: F13

Throughout history empires facilitated trade within their territories by building and securing trade and migration routes, and by imposing common norms, languages, religions, and legal systems, all of which led to the accumulation of imperial capital. In this paper, we collect novel data on the rise and fall of empires over the last 5000 years, construct a measure of accumulated imperial capital between countries, and estimate its relationship with trade patterns today. Our measure of imperial capital has a positive and significant effect on trade beyond potential historical legacies such as sharing a language, a religion, a legal system, or links via natural trade and invasion routes. This suggests a persistent and previously unexplored influence of long-gone empires on current trade.

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