Whether Nevada's charge was a tax on transportation carriers or a tax on individual passengers for leaving or passing through the State.
Holding
It was a tax on passengers and on their exercise of the right to leave or travel through Nevada.
Reasoning
The statutory language was direct: it imposed a capitation tax on every person leaving Nevada by railroad or stagecoach. The carriers and their agents were assigned collection duties, but that collection mechanism did not change the person or activity being taxed.
The Court drew support from The Passenger Cases, where charges nominally imposed on vessel masters according to the number of passengers were understood to burden the passengers themselves. A State cannot avoid constitutional scrutiny merely by collecting a passenger tax through the carrier who transports the passenger.