Can you marry a cousin?

Gettysburg has a PDF showing a map of the United States and a map of the world based on whether they allow cousins to marry:

Laws governing the marriage of first cousins vary widely. In 24 states (pink), such marriages are illegal. In 19 states (green), first cousins are permitted to wed. Seven states (peach) allow first-cousin marriage but with conditions. Maine, for instance, requires genetic counseling; some states say yes only if one partner is sterile. North Carolina prohibits marriage only for double first cousins. Got that?

Researchers who study inbreeding track consanguineous marriages—those between second cousins or closer. In green countries, at least 20 percent and, in some cases, more than 50 percent of marriages fall into this category. Pink countries report 1 to 10 percent consanguinity; peach-colored countries, less than 1 percent. Data is unavailable for white countries.