In addition to choose their president, senator, representatives, mayors, school board, etc, many voters will also have their say on 'ballot measures' or 'propositions'.
These are state-wide plebiscites on specific laws. Sometimes these are funding for taxation, changes to term limits of state officials, or even the use of condoms in pornography.
One of the most frequent issues being put to the voters in a contained referendum, is the use of marijuana.
Voters in Arizona, California, Massachusetts, Maine, Nevada, will decide whether or not to legalise marijuana for recreational use.
In the five states considering the legalisation of marijuana for recreational use, it's already legalised for medical use.
Floridians, Arkansans, and North Dakotans will decide whether or not to legalise weed for medical use, and Montanans will choose whether or not to ease restrictions on marijuana use.
In most of the five states looking to legalise for recreational use, the ballot question proposes legalising the possession and recreational use of marijuana for persons over 21, and in some cases imposes certain sales and cultivation taxes.
In Montana the ballot measure ISO- 8 asks voters whether or not to repeal the 'three patient limit' for medical marijuana providers which stops doctors prescribing marijuana to more than three patients.
According to American election website Ballotpedia, a group opposing ISO-8 and wishing to keep the 'three patient limit' has raised more than twice as much money for campaigning than supporters of ISO-8.