Why is America getting a new $100 billion nuclear weapon?

The reasons for the United States new intercontinental ballistic missile—the ground-based strategic deterrent, or GBSD—are historical, political, and to a significant extent economic. Many people in the states where the new missile will be built and based see it as an economic lifeline. Their elected officials take campaign donations from defense companies, to be sure, but are also trying to deliver jobs in a political environment that has been hostile to government spending on anything but defense.