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(gentle guitar music)

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- [Narrator] After 
six brutal years,

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the two tracks finally come 
together at Promontory Summit.

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On May 10th, 1869,

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the lines are linked 
with the driving

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of a ceremonial golden spike.

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(metal clanking)

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- The moment is immortalized

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in one of the most famous photos

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of the 19th century 
in the United States.

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People believe this photo 
deliberately omits Chinese,

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despite their accomplishment,

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their sacrifice, 
their suffering.

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They were prohibited 
from entering the frame.

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(gentle music) 
(train bell ringing)

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- [Narrator] With the 
railroad now complete,

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the workers stand 
at a crossroads.

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Should they return to China

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or carve out their 
future in America?

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(gentle music)

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Thousands decide to stay 
and take their chances.

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(gentle upbeat music)

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(crowd murmuring)

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(gentle upbeat music)

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- My great-grandfather, 
he was able to save money

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working on the railroad,

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go back to San Francisco,

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and be a partner 
in a general store.

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(gentle upbeat music)

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- [Narrator] The 
bustling quarter

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is the center of life 
for Chinese immigrants.

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Mostly, laborers, young men 
far from their families.

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Chinatown is home.

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(gentle upbeat music)