Europe TL;DR: For reasons beyond human control, rooted deep in the divergent evolutionary histories of the continents, the Columbian Exchange massively benefited the people of Europe and its colonies while bringing catastrophic crumminess to Native Americans.
Hitler invaded the Balkan countries and Greece because they revolted against German rule and because Mussolini botched the invasion of Greece. ... When he invaded Poland with the connivance of Stalin and the USSR the western powers (England, Commonwealth & France) just chose to declare war on Germany<span> and not on the USSR.
I hope my answer has come to your help. God bless and have a nice day ahead!
</span>
A cause of the Hundred Years' War was the disagreements and dissatisfaction over the right to the French land, and the dispute towards the succession to the French throne. Also economic conflicts were also a reason why this long-term war occurred.
True because it's long enough to even call red 21