This year’s death-penalty bombshells — a federal moratorium, a state abolition and the smallest number of executions in more than a decade — have masked what may be the most significant and lasting development. For the first time in the modern history of the death penalty, more than 60 percent of all American executions took place in Texas.

Indeed, said David R. Dow, a law professor at the University of Houston who has represented death row inmates, the day is not far off when essentially all executions in the United States will take place in Texas.

“The reason that Texas will end up monopolizing executions,” he said, “is because every other state will eliminate it de jure, as New Jersey did, or de facto, as other states have.”