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.

Over the past three decades, the proportion of executions nationwide performed in Texas has held relatively steady, averaging 37 percent. Only once before, in 1986, has the state accounted for even a slight majority of the executions, and that was in a year with only 18 executions nationwide.

But this year, enthusiasm for executions outside of Texas dropped sharply. Of last year’s 42 executions, 26 were in Texas. The remaining 16 were spread across nine other states, none of which executed more than three people. Many legal experts say that trend is likely to continue.

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.