Negative: 1  Pollution increased, working conditions were harmful, and with the employed of women and young children, making them work long and hard hours. 2  From the time of its start, the factories and industry has increased the amount of carbon dioxide in the atmosphere by two-folds.
Causes of the Cold War. Cite This Source. Causes of the Cold War Summary & Analysis. In 1945, the United States and Soviet Union were allies, jointly triumphant in World War II, which ended with total victory for Soviet and American forces over Adolf Hitler's Nazi empire in Europe.
The Truman Doctrine became the foundation of American foreign policy, and led in 1949 to the formation of NATO, a full-fledged military alliance that is in effect to this day. Historians often use Truman's speech to date the start of the Cold War.resident Truman made the proclamation in an address to the U.S. Congress on March 12, 1947, amid the crisis of the Greek Civil War (1946â49).