Why was nativism (i.e. anti-foreigner sentiment) so strong in the years 1900 to 1930 approximately?

P. Ward, White Canada Forever.
D. Avery, Reluctant Host
V. Knowles, Strangers at Our Gates
B. Roberts, From Whence They Came
These are sources to be used. These sources are minimum that should be used maybe add one source from a scholarly article.
Please note: all sources used in the essay must be cited in footnotes or endnotes and listed in a bibliography.
A thesis should be provided in the introduction and should be supported by 3-4 arguments

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