What did the so called iron curtain symbolize?

The correct answer to this open question is the following.

The so-called iron curtain symbolized the division of the eastern and western European countries after World War II. It was a symbolic division that included economics and politics between the satellite countries in which Communism was imposed by Joseph Stalin, leader of the Soviet Union, and the western European countries that supported democracy and free enterprises such as France and Great Britain. The Communists countries of that time were East Germany, Czechoslovakia, Rumania, Poland, and Hungary, Albania, and Bulgaria.

c. troops marched forward in close formation against newer, more accurate weapons

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.