Louisiana Purchase happened in 1803, specifically, July 04, 1803. (but the celebration of July 4 remembers this day in 1776, not 1803)
Gadsden Purchase - December 30, 1853.
The difference is a round 50 years, and more specifically 50 years, 5 months and 26 days!
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The industrial revolution indeed was a great factor in the growth of population in industrialized countries. The population in industrialized countries had a sudden rise or increase due to the bigger and greater opportunities provided by the country thus, alluring more people to migrate.
Which passage they can have different meanings
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If the imperial dynasty had continued to rule China, it is most likely that European nations would have gotten more of a foothold in China.
A. <span>Affects more than one region of the world.
</span>For example, in World War II, the turning point was when Hitler began to fall out of power as the other countries (the US, Britain, Russia) started to gain more and more power over him and Germany.