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The day of the first atomic bomb explosion – level 3
16-07-1945On July 16, 1945, the United States successfully conducted the first...
The day the construction of Hoover Dam began – level 1
07-07-1930On July 7, 1930, the construction of the Hoover Dam starts....
The day the construction of Hoover Dam began – level 2
07-07-1930On July 7, 1930, the construction of the Hoover Dam began....
