Lots of people don’t realize that North America almost did this same thing about a billion years ago. Check out the failed rift zone called the Midcontinent Rift. Ever curious why Lake Superior is shaped like that? MCR ground zero.
Also, it displays the same equiangular vertex of three rifts that we see with the Arabian, Nubian and Somalian plates. Which you also see in oxide scum on molten lead. Or on oatmeal, just before it's ready.
The area covered by Nevada, on the other hand, is being pulled apart over the whole state. This creates what is called a basin and range topography. The extension is mostly east-west and you can see the ranges and valleys mostly are north-south due to this. Lots of geothermal there as the spreading rock allows hot rock from below to move close to the surface.