Why were the Chinese so discriminated against as immigrants?

Had different facial features (They don't look like "us")

Weere generally smaller than Europeans (They must be less robust than us)

Dressed differently (They don't wear proper clothes)

Ate different foods prepared in strange ways (They don't make normal food")

Generally lived in communities apart from European based people (They're stand-offish)

Were not Christians (Filthy heathens!)

Spoke a language that Eurpeans could not understand (What art thy saying about us?)

Had a work ethic that let them work hard for lower pay (We'd never work that hard for so little, will they take our jobs?)

Had a social interaction that Europeans found deferential (weaker)

A close examination of these factors indicates no real problem except being "different". For people inclined to discriminate agains others, this is enough.

Explanation:

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.