The outlook for America two-thirds of a century ago

From Charles Davenport's 1943 Science obituary of Harry H. Laughlin:

Some of Laughlin's conclusions and their applications in legislation were opposed by those committed to a different social philosophy, founded on a less thorough analysis of facts. One can not but feel that a generation or two hence Laughlin's work, in helping bring about restricted immigration and thus the preservation of our country from the clash of opposing ideals and instincts found in the more diverse racial or geographical groups, will be the more widely appreciated as our population tends toward greater homogeneity.

[Davenport CB. HARRY HAMILTON LAUGHLIN. Science. 1943 Feb 26;97(2513):194-195.]

Others had other ideas.