World war ll all started around Sep 1, 1939. This all started because of the actions of Hitler invading Poland and taking over Germany
world war ll officially began 2 days later after Hitler invaded Poland. France and Britain declared war on Germany
September 17, soviet troops invaded Poland from the east under attack from both sides Poland fell quickly and by early 1940 Germany and the soviet union had divided control over the nation
on april 9, 1940, Germany simultaneously invaded norway and occupied Denmark and the war began in earnest.
on may 10 German forces swept through Belgium and the Netherlands in what became known as "Blitzkrieg". or the lighting war three days later Hitlers troops crossed the Meuse river and struck french forces at sedan located at the northern end of the Maginot line an elaborate chain of fortification constructed after world war 1 and considered an impenetrable defensive barrier in fact the Germans broke through the line with their planes and continued to the rear rending it useless
The British Expeditionary Force (BEF) was evacuated by sea from Dunkirk in late May, While in the south French Forces mounted a doomed resistance. With France on the verge of collapse, Benito Mussolini of Italy put his pact of Steel with Hitler into action, and Italy declared war against France and Britain on June 10.