A few times a year, the Treasury Department publishes a long list of names announcing all of the Americans who have lately abandoned their U.S. citizenship.
According to the legal website International Tax Blog, the number hovered around 500 a decade ago. Last year, it hit a record high of nearly 3,000.
This was not a gradual change. It was a sudden spike. It's a story of dominoes falling, one after another, leading to an unexpected outcome.