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 (jan 1, 1801 – jan 1, 1920)
Added to timeline:
Date:
jan 1, 1801
jan 1, 1920
~ 119 years