Nixon's curfew announcement came after violence erupted in Ferguson, Mo., early Saturday morning as crowds continued to protest the police shooting a week earlier of Michael Brown, an unarmed 18-year-old black resident.
At least three business were damaged and looted Saturday. Earlier in the week, heavily armed police officers lobbed tear gas and shot rubber bullets into crowds of protesters.
In recent years, authorities in Boston, New Orleans and other cities have enacted curfews as they contended with upheaval caused by hurricanes, racial tension and terrorism.
Last year, Massachusetts Gov.
Tamerlan Tsarnaev died in a shootout with Watertown police in April 2013. Police asked residents of all three cities to remain indoors as they searched for his brother. Dzhokhar Tsarnaev was later located nearby hiding in a boat.
In 2001, then-Mayor Charlie Luken announced an 8 p.m. curfew in Cincinnati after rioting broke out in response to a white police officer killing an unarmed black teenager.
Last month, the Baltimore City Council passed one of the country's strictest curfew laws, requiring children under the age of 14 to be home by 9 p.m. Children up to 16 are required to be home by 10 p.m. on school nights and 11 p.m. on weekends.