The coastal states of California, Oregon and Washington are commonly referred to as the West Coast.
First humans, moved in from Asia at the end of the last Ice Age at least 15k years ago. 
Possibly they came on foot via the Bering land bridge, and/or with small fishing boats along the sea ice edges.
Some moved on to colonize the rest of the Americas. The ones that stayed diversified and developed different habits and languages.
Europeans arrived at San Diego Bay in 1542, but settlements only occurred late in the 18th century; Spanish in the south, Russian and British in the north. 
After the victory in the Mexican-American War California became part of the USA in 1848, in the same timeframe Oregon and Washington also joined the USA.
Today the West Coast has a demographic diverse population with Hispanic influences in the south and Asian to the north.
 Its inhabitants are in general liberal leaning and care for the environment.
SIlicon Valley is the world's high tech power house.
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Mt Rainier
Death Valley
San Diego
Mt St Helens
San Francisco