The eastern boundaries of Prussia (from 1871, part of the German Empire), having remained unchanged since the Treaty of Melno in 1422, became a matter of discussion following World War I, as the newly independent states of Poland and Lithuania emerged. The separatist Act of Tilsit was signed by few pro-Lithuanian oriented Prussian Lithuanians in 1918, demanding the unification of Prussian Lithuania with Lithuania proper. It is traditionally viewed by Lithuanians as expressing the desire of Lithuania Minor to unite with Lithuania – but the majority of Prussian Lithuanians did not want to join with Lithuania and the Prussian Lithuanians did not make up a majority of the population.