Voters in Colorado are casting their ballot over whether the state should be split into two - creating a 51st American state.
Several US states have ballot measures in front of voters on Tuesday, Radio New Zealand's correspondent reports from Denver.
In heavily conservative parts of northern Colorado, voters are being asked if their part of the state should break away from Colorado. The move began as a protest against tough new gun control measures.
Another issue facing Colorado voters is how to tax marijuana. The ballot asks whether the state should adopt a 15% excise tax on pot and an extra 10% on sales tax is also being proposed to fund drug enforcement.
Meanwhile, people in New York, Boston, and Detroit are selecting new mayors, while voters in Virginia and New Jersey are picking their governors.