Why were the crusades called "history's most successful failure"

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?

What mountain range is located near 60*n and 60*e

How did modern american history begin with “contact”?