What was the first official pair of sister cities?

Toledo, Ohio and Toledo, Spain

Explanation:

Toledo, Ohio and Toledo, Spain were the first official pair of sister cities.

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Toledo, Ohio and Toledo, Spain is the first official pair of sister cities.

Explanation:

For the first time, the official Sister Cities program was established in 1931. There are old evidences of planned exchanges between settlements around the world, with help of legal agreement for the advancement of cross-cultural ties on other sides of the globe.  

According to Sister Cities International, Toledo, Ohio, and Toledo, Spain, signed a twinning document for the first time. After WWII, this concept kept growing and evolved. It included the links of between the friendly sisters.  

leader‎: ‎president seat‎: ‎washington, d.c.

main organ‎: ‎cabinet legislature‎: ‎congress

2,407.2 miles. or 32 hours.