I'm not positive but I think it was because of nuclear power where each country kept on acquiring more nuclear powers. Each country was trying to out power the other and this caused tensions to be higher since there was a risk of war.
Answer:
Aryanism is an ideology of racial supremacy which views the supposed Aryan race as a distinct and superior racial group which is entitled to rule the rest of humanity. Initially promoted by racist theorists such as Arthur de Gobineau and Houston Stewart Chamberlain, Aryanism reached its peak of influence in Nazi Germany. In the 1930s and 40s, the regime applied the ideology with full force, sparking World War II with the 1939 invasion of Poland in pursuit of Lebensraum, or living space, for the Aryan people. The racial policies which were implemented by the Nazis during the 1930s came to a head during their conquest of Europe and the Soviet Union, culminating in the industrial mass murder of six million Jews and eleven million other victims in what is now known as the Holocaust.
Sun Yat Sen was a Chinese politician, medical doctor, and philosopher that served as the first provisional president of the Republic of China and he was the first leader of the Kuomintang.
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