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In the 9th Century
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19th & 20th Century
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In the 20th century
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The ending of Nazi domination of Europe
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1945-1989, The iron curtain symbolized the fighting and physical boundary dividing Europe into 2 seperate areas from the end of WW2. It seperated the communist and capitalist states.
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During world war 1, trench warfare was sed, it is a form of occupied fighting lines, in which troops are largely immune to the enemy's small arms fire and are substantially sheltered from artillery.