Franco-German Earth is a parallel-universe version of Earth in which the Franco-German Empire is the preeeminent superpower. In 1871 A.D., France and Germany were merged into the Franco-German Empire with a constitutional monarch, an elected central parliament, and France and the German states retaining some local autonomy under a federal system. This was a result of the German state of Prussia defeating France the prior year in the Franco-Prussian War.
In the decade of the 1890s, the Austrian-Hungarian Empire suffered aemed revolts which saw the creation of independent Czechslovakian and Yugoslavian states, and ethnic conflicts between Austrians and Hungarians. By the year 1900, Hungary also became independent and Austria was absorbed into the Franco-German Empire as a constituent state.
In the Franco-Germano-Spanish War of 1902-1906, Spain, too, became a state within the Franco-German Empire.
During the two decades of the 1880s and 1890s, the Franco-Germans also established colonial possessions in Africa, southeast Asia, and the Pacific islands.
The Franco-German Empire established a formal alliance with Japan in 1901, and by 1912 both governments had established joint Japanese/Franco-German protectorates in Korea and China.
The Great World War of 1914-1918 saw the Franco-Germans and the Japanese pitted against an alliance of Great Britain, Russia, the United States, Australia, and New Zealand. It also saw the further advances in technology, especially airplanes, helicopters, submarines, wireless radio, and magnetic-powered cannons.
The Russians saw their western territories annexed to the Franco-German Empire as the constituent state of Slavia and the loss of much of Siberia to Japan.
Britain saw it lose it's African colonies to Franco-German rule, and it's Pacific island possessions, Hong Kong, India, and Burma transformed into joint Japanese/Franco-German protectorates.
The United States saw itself lose Alaska, Hawaii, Guam, American Samoa, the Northern Marianas Islands, and the Philippines, which all became joint Japanese/Franco-German protectorates.
In 1919, the Franco-Germans swiftly invaded Denmark, the Netherlands, Belgium, and Portugual, which all four in 1920 became official states of the Franco-German Empire.
The Franco-Germano-Japanese War of 1923-1927 saw the Franco-Germans gain exclusive control of India, Burma, and most ex-U.S. Pacific island territories but lose Alaska, the Phillippines, China, and Korea to the exclusive control of Japan.
The current year is 1930.
The only Transdimensional Void Runners to visit Franco-German Earth are those from the alternate-Earth nation of the Empire of the Itinerate Tree Dweller (see also Empire of the Itinerate Tree Dweller in TVR).