since early 19th - demographic development growth in population because prolonging life expectancy -development of western countries because of capitalism. 1815 Great Britain was a dominant leader and world superpower, but at the end of the 19th the USA took the crown (1 ene 1801 año – 1 ene 1920 año)
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fecha:
1 ene 1801 año
1 ene 1920 año
~ 119 years