Many view the greater integration of the world economy as a relatively modern phenomenon. Christopher Meissner puts the current level of international trade, the depth of global capital markets, and immigration in historical context, drawing on his new book One From the Many: The Global Economy Since 1850. Christopher explains how both technological and political changes since the mid-19th century have affected the integration of the world economy. He also discusses how trade, capital flows, and migration have created benefits that made many people better off, but this has been uneven and some people have been left behind. Christopher is a Professor in the Department of Economics at the University of California, Davis, and a Research Associate of the National Bureau of Economic Research.