1939 --- The war begins as Poland falls to Germany.
1940 --- France, Hollband, Belgium, Norway, and Denmark fall to Germany.
Italy enters the war on the Axis side, attacks Great Britain in North Africa, and invades Greece.
German invasion of Great Britain is planned but never occurs.
1941 --- In North Africa, Great Britain pushes Italy back.
Germany invades Russia and reinforces Italy in North Africa.
Japan enters the war on the Axis side, and the US enters the war on the Allied side.
1942 --- War seesaws in North Africa.
The decline of agricultural economies. Hope this helps :)
Civilization is the establishment of culture and a system of government in a society. And due to such privilege the society enjoys it thrives and grow larger and there would be a population growth and also poverty would be present and thus slums are created due to such growth but the system didn't change to cope up with the change happening.