With tonight's switch by West Virginia Gov. Jim Justice from Democrat to Republican, the GOP expanded its dominance of state governments.
The Republican Party now controls the governorships and the state legislatures of 26 states (including Nebraska's supposedly nonpartisan legislature). Altogether, the populations in these states account for 48 percent of the U.S. population, according to 2016 Census estimates.
Meanwhile, Democrats hold complete control of government in just six states and the District of Columbia. This renders them capable of legislating over 17 percent of the population without any Republican cooperation.
Visually, the addition of West Virginia makes the transformation since 2009 even more stunning. Here is Ballotpedia's "trifecta" map for 2009:
And here's their map for today, modified by hand to account for Justice's switch: