read the excerpt: "From Stettin in the Baltic to Trieste in the Adriatic, an iron curtain has descended across the continent." The term iron curtain refers to which of the following?

Which answer best describes the u. s. national road? it ran from atlanta to baltimore and followed the railroad. it ran from new york to chicago and was made from wooden planks. it ran from massachusetts to ohio and ran parallel to the canal system. it ran from maryland to illinois and was made using macadam construction.