World War I got bogged down in very slow moving trench warfare because machine guns and rapid firing artillery. Tanks were invented to break these trenches. But if What if tanks were fully developed already and World War I started with them ? POD is that the Russo Japanese War gets bogged down in trench warfare. Trench Warfare was already present in the war for example at Battle of Hsimucheng. This trench extends from the Yalu river via the outskirts of Shenyang to Port Arthur. This results in a stalemate. In the resulting peace Russia retains exclusive influence in Manchuria along with Port Arthur and Japan gains exclusive influence in Korea. Anglo-Russian Convention of 1907 still happen just as OTL. But this time every Superpower races to find a means to break these trenches. All of them find it in Tanks. American doesn't do much because it didn't have any potential land war with another Superpower it could think of. Britain develops the Mark VIII of OTL. France develops the OTL Renault FT which is shared with Russia because of its limited automotive industry. Germany develops the OTL A7V which shared with Austria Hungary because it's own project failed. Italy develops the Fiat 2000 of OTL. Radio is invented along with them in America seperately. But it proliferates to the rest of the world. Portuguese Revolution devolves into civil war in which all of Europe's superpowers intervene. In it all learn crucial lessons in armored warfare. July crisis happens just as OTL resulting World War I.
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