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Unresolved issues from WW1. In many ways WW2 can simply be considered the second half of WW1 after a two decade intermission.
There was more than two countries left in the world after WW1.
WW2 started in 1939 and it started because of WW1, Germany was in great shame, the treaty of Versalles in post-WW1 meant Germany couldn't build an airforce or a sumbarine fleet, it also restricted all other military classes. Germany also lost large amounts of land during WW1 further shaming them. Hitler was a troop in WW1 and remarked "what a shame this is to our country" Many factors played into WW2
While Tsar Nicholas II was absent from St. Petersburg on visits to the front during WW1, his wife, Tsarina Alexandra, ruled the country heavily influenced by Grigory Rasputin.
ww1 was about 11,016,000. ww2 was about 59,028,000
pudding
The two examples of direct control in ww1 included price controls and rent controls.
ww1 and 2
WW1 and WW2
kuifkuil
The assassination of Archduke Franz Ferdinand of Austria on 28 June 1914 triggered the start of World War I.
Mauser and Springfiled are two.
Bloody and unfair
France & germany
by left and right nut
The Central and Entente powers.
The Tank and the Jeep