WT puts too much emphasis on WWI as breaking point in the humanity, but for Europeans, it was rather forgotten war once WWII erupted. WWI started in July 28, 1914 before the JW claimed born of the invisible kingdom in October. However, [WT] fails to mention that war in Balkans was already in progress for several years as a result of disintegration of the Ottoman Empire and mutual war between Serbia and Bulgaria over Macedonia where others countries joined for their benefits. The war eventually spilled into A-U where Bosnia had huge Serbian minorities. Once the WWI ended, antiquated monarchies were gone, but much of the political structures remained intact until 1940's. France continued as III. Republic until 1940. Germany was still European superpower as was Soviet Russia [renamed USSR]. Countries that were created on the ruins of Austrian empire inherited pretty much entire political and economic system that surived interwar period until communist takeover.
WT used to claim that WWII was a mortal wound of the Beast that went to abyss and returned with a full strenght. WWI has nothing to do with the heavenly Kingdom. Russell believed that the end of times started with Napoleonic Wars and French Revolution. When Rutherford usurped power over WT, there were no more any survivors of the Napoleonic Wars, so he moved the beginning of the end for another 100 years.