WW1 ends on 11/11 1918
The US did not begin WW1. It had been under way a long time before the US finally decided to take part.
1835
WW1 1914 WW2 1939
The First World War began in Europe in 1914. The event that started the war was the assassination of Archduke Franz Ferdinand.
It was still called Europe then.
Aviation regulation really began after WW1 and continued with different rules and regulations every year since then.
Europe. Primarily in France,
In 1618 with a conflict between Bohemia and the emperor.
September 1,1939-May 8,1945
Archduke Franz Ferdinand of Austria.
after ww1