That would depend on how you wanted to define 'US West Coast'. .
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The Pacific Ocean is on the west coast of the US.
Because of the large Japanese population in the west coast states such as California
that the US should be expanded to the west coast.
Rockey Moutains
The Transcontinental railroad was completed in a ceremony in the Utah Territory in 1869. The railway enabled travel from the US east coast to the west coast.