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The modern industrial economies of the three powers allowed for scientific and technological advances that led to increasingly powerful and more lethal systems of weapons (more potent cannons, new warships, the first war airplanes, devastating gun machines and poisonus gas, for example). It also was the basis for mobilizing and keeping large armies in 1914-1918. WWI produced the horrendous figure of 40 million casualties, half of them dead, something never seen before in history.
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People's point of view can change to suit changes in historical context. The conclusion that U.S attitudes toward panama canal during the 20th century support the opinion that people's point of view can change depending on the historical context
