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One event that caused great fear in the United States in 1949 was the communist takeover of China. The other event was the Soviet Union detonating an atomic bomb.
The Holocaust took place from about 1940 to 1945, the international conflict was the Second World War.
Boxer rebellion
The construction of the Berlin Wall.
Japan, after the US dropped atomic bombs on Hiroshima and Nagasaki in early August 1945.
early 1940s
No
in the early 1940s.
Willy Higginbotham, who invented the first video arcade game, worked on advanced radar displays for B28 bombers and went on to work for the Manhattan Project where he designed the timing mechanism for the first atomic bomb in the early 1940's.
Early 1940s
Computers were invented in the early to mid 1940s.
early 1940s to the end of WII
The United Farm Workers started in the early 1940s
On very early versions of the Periodic Table the elements were organized by atomic mass, because it was measurable and the concept of atomic number was unknown. After Rutherford and Bohr developed their model of the structure of the atom, the Periodic Table was reorganized by atomic number (which caused a few elements to swap positions).
Anne Frank longed for freedom, peace, safety, and a world without persecution during the early 1940s while hiding from the Nazis in Amsterdam.
"early detergents were not biodegradable like soap, they became a public nuisance, causing sewage problems." http://www.bookrags.com/research/soaps-and-detergents-woc/
The Cold War