As a long-time advocate of expanded immigration, I am delighted to have left/liberal Matthew Yglesias as an ally. Yglesias, who helped found online magazine Vox, is one of the rising stars in journalism and, especially, economic journalism. His latest book, One Billion Americans, advocates what the title says: we should change institutions so that we have 1 billion Americans. This book is particularly needed now. Yglesias’s major argument for more population, though, is not mine: he wants the United States to continue to be the world’s dominant power and worries that if we do not greatly expand our population, China will dominate.