The US faces a huge housing shortage, outdated transportation systems, a dearth of affordable childcare, and an urgent need for substantial clean energy. But why haven’t we been able to build out all of the things we so acutely need?  Fortunately, these problems are not without solutions. We just need to find them. And for this series, How They Built It, we have.  Vox has sent some of the country’s best reporters on infrastructure and policy to discover how places are pulling off these deeply transformative projects, ones that can feel so out of reach in much of the US.  In Sweden,...