There’s almost no examples of that happening in the past 50 years because various courts typically work together so as not to conflict.
A nationwide injunction is not some final ruling for the whole country. It’s a temporary action to prevent harm while the full merits of a case are investigated. Let’s look back at a case where the shoe was on the other foot and a nationwide injunction was upheld by the Appeals Court.
After Obama signed the DACA EO, the state of Texas sued. They said DACA caused injury to them by forcing them to provide these people with state subsidized driver’s licenses, which have a cost. The state court issued a nationwide injunction, and that’s the only way to mitigate the potential injury. It doesn’t do any good to for the judge to say, “Ok, Texas, we won’t let DACA take effect in Texas solely,” because people with DACA status in other states could simply move to Texas, apply for a driver’s license, and cause the same injury that TX was seeking relief from.
The same thing can exist in other cases. Imagine a POTUS signs an EO with some new election guideline right before an election. What good is a ruling for a plaintiff that doesn’t apply elsewhere? What good is a ruling that only applies to one district, but no other district in the state and none of the other 49 states?