America is in decline. Fewer children are born each year due to financial pressure. Thousands flee our iconic cities with their housing shortages and broken infrastructure. While we tie ourselves into knots trying to stop the flow of immigrants, our exhausted economy deflates the heartland's already shrinking population. To survive China's impending global takeover (not to mention Russia), we can't afford to be weak. We need to get bigger, much bigger. We need one billion Americans. In this timely and provocative book, Matthew Yglesias makes the case for massive population growth through humane family and immigration policy. Of course, more people requires more housing, not to mention better transportation, improved education, a revitalized welfare system, and climate change mitigation. Why not do it all, and stay on top forever?