On May 29, 1453, after an Ottoman army stormed Constantinople, Mehmed triumphantly entered the Hagia Sophia, which would become the city's leading mosque. Emperor Constantine XI died in battle that day, and the decline and fall of the Byzantine Empire was complete.
The dynasty that restored unity to China after Shi Huangdi's government crumbled was the Zhou Dynasty
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The tactic, Germany First was where the allies concentrated on Germany, as they theorized that Germany would be a long-lasting affect compared to Italy or the Japanese Empire. One of their strategies was to outlast Germany, constantly pouring resources into the war effort, while blockading Germany. America's power of mechanical manufacturing was also a major point in the war in Europe. They really just pushed through the German lines with sheer numbers.
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