The sister-cities concept was introduced in 1956 by then United States president Dwight Eisenhower as part of a people-to-people citizen diplomacy initiative.

According to Sister Cities International, a Sister City is officially a broad-based approved long-term partnership between two communities in two countries. Sister Cities partnerships have the potential to carry out the widest possible diversity of activities including every type of municipal, business, professional, educational and cultural exchange. Sister Cities programs inherently involves the three main sectors in a community: local government, business and a wide variety of citizen volunteers.

 

Subjects of Pueblo's Sister Cities Program have been: healthcare, environment, arts, education, economic and business development, public safety, municipal training, and sports.