The California Immigrant Union was an organization founded in 1869 to promote the settlement of California by people from the Eastern United States and from Europe.All about California and the inducements to settle there, California Immigrant Union, 1870.Daily Alta California: "California Immigrant Union," 14 October 1872 — California Digital Newspaper Collection.
The boosterism organization appears to have been active through at least 1875.
See also
William Erwin Willmore
References