March 26th is International Sister Cities Day

Sister Cities International is a nonprofit citizen diplomacy network that creates and strengthens partnerships between communities in the United States and those in other countries, particularly through the establishment of "sister cities". More than 2,000 cities, states and counties are partnered in 136 countries around the world. The organization "strives to build global cooperation at the municipal level, promote cultural understanding and stimulate economic development".

As the official organization which links jurisdictions in the U.S. with communities worldwide, Sister Cities International recognizes, registers, and coordinates sister city, county, municipalities, oblasts, prefectures, provinces, regions, state, town, and village linkages.

The U.S. sister city program began in 1956 when President Dwight D. Eisenhower proposed a people-to-people, citizen diplomacy initiative. Originally a program of the National League of Cities, Sister Cities International became a separate, nonprofit corporation in 1967, due to the growth and popularity of the U.S. program.