The sister city concept has now been around for several decades and yet there remains to be a paucity of literature dealing with the subject. Despite this unfortunate fact, there has been some literature written trying to deal with the progression of what sparked cities to try to establish sister city relationships with one another. However, this is still not enough. Diasporas have been neglected as a potential cause, which I try to remedy by employing the method of explaining outcome process tracing in a case study of the sister city relationship that began to be explored between the cities of Governador Valadares, Brazil and Framingham, United States.Information was collected using materials such as news articles from such sources as the Metrowest Daily News and official websites such as Governador Valadares’ official city webpage, and various histories, ethnographies, and other sources were also considered especially focusing on Framingham and the Greater Boston Area, allowing for the collection of materials of both primary and secondary nature and thus an in-depth analysis.What was found was that indeed, it is true that diaspora had a hand in influencing the negotiation of a sister city relationship between the two cities; First, the context of the Brazilian Diaspora in the United States was explained and analysed and it was found that it could be termed a termed a proletarian labour diaspora.Explaining outcome process tracing was then employed to inductively explain how the spark can be created, which suggested that the causal mechanism between the diaspora and the negotiations for the SCR to begin were that of an enclave forming due to the diaspora which then allowed social capital to be accumulated, allowing for Governador Valadares to grow despite Brazil’s bad economic conditions due to remittances, leading to the mayor of Governador Valadares initiating the talks.