your answer would be the assassination of archduke ferdinand. this is one of the main reasons that started conflict and ended up having a world war. archduke ferdinand was a member of the imperial habsburg dynasty, and a lot of people had respect for him. a terrorist from serbia named gavrillo princip assassinated him, and that made a huge out burst. because of the assassination of archduke ferdinand, the two countries had a lot of drama between each other, making them look for other countries to ally with to make their military's stronger, which led to them using that power against each other at war. if archduke ferdinand wasn't assassinated, the outcome of this world would be different. there were many events that caused europe to get mad and wanting to get into war, but this particular event is the main reason that threw europe off and made them go to war.
economists like waddill catchings, william trufant foster, rexford tugwell, adolph berle (and later john kenneth galbraith), popularized a theory that had some influence franklin d. roosevelt. this theory maintained that the economy produced more goods than consumers could buy, because consumers did not have enough income. according to this point of view, salaries had increased at a lower rate than productivity in the 20s. most of the benefits of increased productivity were allocated to profits, which were located in the stock market crisis instead of in consumer purchases. in this way the unequal distribution of wealth in the 20s caused the great depression.
according to this point of view, the original cause of the great depression was an over-investment worldwide while the levels of wages and profits of independent companies fell short in creating sufficient purchasing power. it was argued that the government should intervene through an increase in the taxes of the richest to make income more equal. with the growing income, the government was able to create public works to increase employment and boost the economy. in us economic policies it had been the opposite until 1932. the revenue law of 1932 and the public works programs introduced by hoover in his last year as president and resumed by roosevelt, created redistribution of purchasing power.
great britain - david lloyd george
france - georges clemenceau
united states - woodrow wilson
italy - vittorio orlando
these guys are known as the "big four"
d, after the victory at saratoga france gave open support to the united states including arms, money and ships.