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Map of Europe Divided, 1955
Gale Encyclopedia of U.S. Economic History. 1999.

In 1949 the U.S. and 11 European nations formed the North Atlantic Treaty Organization (NATO), with intentions of safeguarding against Communist expansion. The Communist Bloc responded in 1955 with the Warsaw Pact.
 
The Gale Group.
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Source Citation   (MLA 8th Edition)
"Map of Europe Divided, 1955." Gale Encyclopedia of U.S. Economic History, edited by Thomas Carson and Mary Bonk, Gale, 1999. Canada In Context, http%3A%2F%2Flink.galegroup.com%2Fapps%2Fdoc%2FEJ2210040848%2FCIC%3Fu%3Domni%26sid%3DCIC%26xid%3Dbf322bc7. Accessed 25 Sept. 2018.

Gale Document Number: GALE|EJ2210040848