My grandmother, who worked on a bomber assembly line, was part of a workforce that turned out the best products on Earth. The two of them shared the optimism of a nation that had triumphed over a depression and fascism. They understood they were part of something larger, that they were contributing to a story of success that every American had a chance to share, the basic American promise that if you worked hard, you could do well enough to raise a family, own a home, send your kids to college, and put a little away for retirement.