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As the speed of an object decreases, its wavelength
First World War
A global conflict that lasted from 1914 to 1918, involving many of the world's nations and resulting in significant geopolitical changes and millions of casualties.
Japan Invaded China
This refers to several instances of military incursions by Japan into China, most notably the Second Sino-Japanese War (1937-1945), which was part of the broader conflict of World War II.
1930s
The decade from 1930 to 1939, marked globally by the Great Depression, economic challenges, and the lead-up to World War II.
Germany Invaded Poland
The event on September 1, 1939, marking the beginning of World War II, when Nazi Germany initiated an attack on Poland, leading to the swift involvement of other nations.
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