Travel Warnings are issued by the US Department of State from time to time to describe long-term, protracted conditions that make a country dangerous or unstable. It is also issued when the U.S. Government's ability to assist American citizens is constrained due to the closure of an embassy or consulate. Additionally, the State Department issues Country Specific Information for every country of the world with information on such matters as the health conditions, crime, unusual currency or entry requirements, any areas of instability, and the location of the nearest U.S. embassy or consulate in the subject country.
The State Department also issues Travel Alerts to disseminate information quickly about terrorist threats and other relatively short-term conditions that pose significant risks or disruptions to Americans.
In order to ensure safe journey all American overseas travelers should register their travel with the Department of State which makes it possible to contact a traveler if necessary, whether because of a family emergency in the United States or because of a crisis in the place the traveler is visiting. Registration is a free service provided by the State Department, and is easily accomplished online at https://travelregistration.state.gov.