How did Tan Pan Alley best signify a cultural shift in the United States?
A. It resulted in the development of a uniquely American style of music
B. It encouraged workers to expect leisure time and weekend breaks
C. it led to the rise of baseball as the national American pastime
D. It opened movie theaters and established a new entertainment industry

explanation:

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the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.