What were the "Four Elements of the Columbian Exchange"?

How many citizens of mexico does it take to equal the ecological footprint of the average citizen of the united states? it takes nearly three mexican citizens to equal the ecological footprint of the average u.s. citizen. it takes about 12 mexican citizens to equal the ecological footprint of the average u.s. citizen. it takes just over eight mexican citizens to equal the ecological footprint of the average u.s. citizen. two citizens of mexico equal the ecological footprint of one average citizen of the united states. they are essentially equal?

Which feature of government does montesquieu argue for in his book de l’esprit des lois (spirit of laws)?

Which nation most to bail out greece’s failing economy?