<span>the Byzantine emperor refused to help the pope defend against Rome from my invaders because he thought it was the pope's territory</span>
Russia in the late 19th and early 20th century was a massive empire, stretching from Poland to the Pacific, and home in 1914 to 165 million people of many languages, religions, and cultures. Ruling such a massive state was difficult, and the long-term problems within Russia were eroding the Romanov monarchy. In 1917, this decay finally produced a revolution<span>, which swept the old system away. Several key fault lines can be identified as long-term causes, while the short-term trigger is accepted as being </span>World War 1<span>.
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The difference between endothermic and exothermic reactions lies in the words themselves. "Thermic" refers to heat, just as in the word "thermometer." "Exo" means "outside" and "endo" means "inside." Thus, an endothermic reaction pulls heat into an object or area, while an exothermic reaction expels heat.
The United States spent $15 million on the Louisiana Purchase (about $300 million in today's terms adjusted for inflation), which was an incredibly small sum.
