The early 1960s, especially between 1960 and 1964, were the years in which a number of LEGO-based cities and towns in the Danish Realm voluntarily “disassociated” from the Realm, and then re-associated into new, much smaller LEGO-centric Realms. This was the case with the Cities of Bricklyn, South Bricklyn, and Bricklyn Junction, Vermont, which re-associated as the Tripartite Realm of Bricklyn.

In 1969 many of these new Realms also banded together to form the influential economic and cultural alliance known as the League of Inland Cities.