Some good thoughts. It was also the spring of nations which might be worth considering:

• Austria’s-Hungarian empire dissolved – several new Balkan states were established
• Ottoman Empire disintegrated; seeing the Arab nations still seen today (mostly) establishes
• Germany transitioned from a monarchy to a democracy
• Tsarist Russia collapsed and the USSR was born setting the course for much of the 20th centuries geopolitics
• America ascended as the financial capital of the world, eclipsing London
• First modern genocide of the Armenians, Greeks and others as the Ottoman Empire collapsed
• The nature of warfare changed with the introduction of Tanks and Aeroplanes and Dreadnought