Refugees, exiles, and adventurers from across Europe, and from as far as the United States and China, arrived in the territory boosting the population. This growth and new ideas helped to expand the economy of Neutral Moresnet. A lack of central authority and the option to use several different law systems to settle disputes also added to the uniqueness of the land.
In 1908 the territory had become a gathering point of speakers of Esperanto. Soon the territory declared its independence as Amikejo, a word in Esperanto meaning 'place of friendship'. The World Congress of Esperanto that met in Dresden declared the settlement the world capital of Esperanto.
Its neighbors were unsure what to do with this territory since both Belgium and Germany neglected for decades their obligation to oversee it. Neither wanted to cause a diplomatic situation on the others border. By 1920 with the German Empire more concerned with monitoring wars in the Balkans and the failing Ottoman Empire, it paid less attention to its borders with Belgium and France. This allowed Amikejo to continue to prosper as a free trade city and through smuggling.
Amikejo would eventually gain recognition by other nations. Once this happened it became a small free state not much larger than Monaco.
(For more information on Neutral Moresnet see Peter C. Earle's short book A Century of Anarchy: Neutral Moresnet through the Revisionist Lens.)
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Sean Sherman has been a fan of alternate timelines ever since seeing Spock with a goatee. By day he is a CPA, at night he explores the multiverse and shares his findings over at his blog, Other Times.