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PLEASE HELP! Which country had the highest percentage of railroad track miles in comparison to total square miles in 1870? What about 1900? (picture attatched)

PLEASE HELP Which country had the highest percentage of railroad track miles in comparison to total square miles in 1870 What about 1900 picture attatched class=

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parishfloyd05
united states would be it
madeleinephillips14
united states  is the answer because it has the greatest amount on the charts. So sorry if I am wrong.