In case of what country's attack was the origins of the Central Powers?
Central Powers The Central Powers (German: "Mittelmächte" ; Hungarian: "Központi hatalmak" ; Turkish: "İttifak Devletleri" or "Bağlaşma Devletleri" ; Bulgarian: Централни сили "Tsentralni sili" ), consisting of Germany, Austria-Hungary , the Ottoman Empire and Bulgaria – hence also known as the Quadruple Alliance (German: "Vierbund" ) – was one of the two main factions during World War I (1914–18). It faced and was defeated by the Allied Powers that had formed around the Triple Entente. The Powers' origin was the alliance of Germany and Austria-Hungary in 1879. The Ottoman Empire and Bulgaria did not join until after World War I had begun, although the Ottoman Empire retained close relations with both Germany and Austria-Hungary since the beginning of the 20th century.
Foreign involvement in the Spanish Civil War The Spanish Civil War had large numbers of non-Spanish citizens participating in combat and advisory positions. The governments of Germany, Italy—and to a lesser extent Portugal—contributed money, munitions, manpower and support to Nationalist forces led by Francisco Franco. The government of the Soviet Union, and to a lesser extent France and Mexico, likewise aided the Republicans (Loyalists) of the Second Spanish Republic. The aid came even after all the European powers had signed a Non-Intervention Agreement in 1936. While individual sympathy for the plight of the Spanish Republic was widespread in the liberal democracies, pacifism and the fear of another world war prevented them from selling or giving arms. The Nationalist pleas meanwhile were answered within days by Hitler and Mussolini.