Well the 2003 Northeast blackout was started by a power utility in Ohio, and took out most of the north-east USA and even Ontario -- making it an international outage.
The 2011 Southwest blackout was caused by a substation in Arizona, and took down power in large parts of California and Tijuana (another international one, fun).
There was apparently one in 2019 in Argentina, Paraguay, and Uruguay that was started by a transmission line in Argentina.
Not super common, but more common than you'd think, power grids are very interconnected and weird.
The premise of this question is that we know how often a power outage in Nebraska was caused by a power outage in New York. We don't know, and the conclusion should not be that it is not that often, but that we do not know.
If anything is vulnerable to cascading, domino, effects, it is electric grids: interconnected networks, even at an intercontinental level.
Although, given the tech landscape today, that's not a great 1:1 example anyway.