Its the soviet union my good sir
These are Arabic, Chinese, English, French, Russian and Spanish.
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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I think it would either be b or c but i am thinking more b
