1 September 1939, Nazi Germany invaded Poland " The Second World War began in Europe

[irisblue]

2. In my armchair opinion, WW1, in Europe at least, led to WW2.

wiki-https://en.m.wikipedia.org/wiki/World_War_I_casualties

snip-"The total number of deaths includes from 9 to 11 million military personnel. The civilian death toll was about 6 to 13 million.[1][2] The Triple Entente (also known as the Allies) lost about 6 million military personnel while the Central Powers lost about 4 million. At least 2 million died from diseases and 6 million went missing, presumed dead. This article lists the casualties of the belligerent powers based on official published sources.

About two-thirds of military deaths in World War I were in battle, unlike the conflicts that took place in the 19th century when the majority of deaths were due to disease. Nevertheless, disease, including the 1918 flu pandemic and deaths while held as prisoners of war, still caused about one third of total military deaths for all belligerents."

this is not a long article, but more there


This a giant huge number of humans dying in the first half of the 20th century.

My knowledge of African, Central & South American, Pan Pacific nations, India is limited during that time.