Some very important transitional years ending in "7": 1917, 1947, and 1967 and (possibly!) 2017. First,let's cover 1927. Wilson severs ties with Germany, Russian Revolution, and collapse of the Ottoman Empire as British troops capture Baghdad and begin carving up the Middle East turning it into the current mess of today. Big year for Cosmological publication of Einstein.
https://worldhistoryproject.org/1917 https://worldhistoryproject.org/1917
