The Columbian Exchange was when the old world (Europe) trade with the new world (America) items. for example: Old World had horses. So if Europe never came to America... we wouldn't have them. Or new world had tomatoes. If Europe didn't have tomatoes... We wouldn't have pizza or delicious Italian goods.
One important factor was Russia’s harsh climate, Russia is brutally cold and because of that he was not prepared for the weather and climate that would face him. I’m not sure of the second reason though
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feudatory form and monarchy form
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They didn’t think it was a good move and they attacked
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