WWII WWII was the most influential and devastating military conflict in world history with an estimated 70-85 million casualties, around 3% of the world population in 1940 costing the world over 11 trillion USD in today's money, this also lead way to crucial scientific discoveries such as penicillin and blood transfusions and some not so helpful such as atomic bombs, Technology was also greatly advanced especially in weaponry, aviation and radio communication. WWII is officially said to have started in 1939 following Germanys invasion of Poland although many believe war should have been declared many times earlier. WWII is said to have been caused by many different occurrences in 1930s Europe, Germany had lost the first World war to a mainly British opponent and this left their country Inruins and in debt to many other nations and had their military power restricted this was known as the treaty of Versailles. In 1929 the infamous wall street crash occurred leading to the recall of Us loans to Germany leading to the economy to crash in Germany due to high unemployment and widespread poverty, at this time people were desperate and looking for a quick fix and they looked over to Italy and saw how their dictatorship was working and Hitler at the time a member of the Nazi party rose to the top and managed to gain total control using propaganda, he blamed what he called the burden on society, people such as Jews, the disabled and Gyspys. These people were heavily discriminated against. Hitler also sneakily broke the treaty of Versailles and an appeasement was signed between Germany, France and England in the hope to keep Hitler happy to prevent a war, when we see all these factors together we can see the quick sequence of events to lead to the horrific war that was to follow. In September of 1938, Adolf Hitler turned his focus towards the roughly 3 million Germans living in Czechoslovakiknownon as the Sutnenland and invaded it reclaiming the land as german land breaking the Munich Pact. 1 year later in September 1939 Hitler ordered his army to invade using blitzkrieg tactics by the Germans from the south and the Russians invaded from the east, many experts say this was the real start of WWII, the polish army quickly fell back and surrendered on the 6th of October, this lead to France who had a pact with Poland siding against Germany and eventually Britain and others would assist France and Poland. Germany continued on their warpath and would break the french border on the 10 of May 1940 and through the blitzkrieg tactics made France surrender after 56 days in June of 1940, Germany now had mainland Europe mostly to themselves as the majority of the British army would flee back to Britain in the controversial battle of Dunkirk to regroup. On the 6th of June 1944, Allied troops launched the largest naval invasion ever and after huge loss gained a foothold in northwest France and began the advance towards the Rhine, this was a huge victory for the Allies as they were now on the offensive. In 1942 Hitler had broke his agreement with Stalin and began to advance east towards Russia in hope of gaining control of Russias vast supply of oil and huge production capability, this is a decision he would later regret as the battle was one of the bloodiest battles of all time with an estimated 2 million casualties, the German troops were under-equipped as their equipment was not working due to low temperatures starving and freezing to death and outgunned by hundreds of thousands of Soviet troops. Because of this turn of events, Stalin now supported the allies and began to advance on Germany from the east. Around this time there was also a fierce battle going on over the British channel between the RAF and the Luftwaffe, the German airforce was relentlessly bombing major cities in England especially London while the Royal air force was trying to defend the skies, this battle lead to many technological advances in radar detection and secrete message decoding. Until up to 1941 the USA wasn't directly involved with the war, only helping supply the Allies with weapons. But in December of 1941 early on a Sunday morning, this all changed, Japanese bombers launched an air raid on pearl harbour Hawai sinking 4 battleships and damaging many others, destroying 200 aircraft and claiming the lives of 2,335 people. The next day America would formally declare war against the nazis and japan.