National Security Study Memorandum 200. Adapted as policy by President General Ford originally classified.  https://en.wikipedia.org/wiki/National_Security_Study_Memorandum_200 
1970s
                                    
“There are four ways through which a nation's population can vanish: 1. Through obliteration in war; 2. Through their lands being swamped by labor-driven immigration; 3. Through physical mixing with newcomers; and 4. The second and third factors above combined with a decreasing birth rate amongst the original population. Ancient Rome vanished because of the last three factors: now exactly the same scenario is being played out in Western Europe, North America and Australia. Unless checked, the demographic trends show conclusively that Whites will be a minority in all three of these continents by the year 2100. After that, it is only then a question of time and Whites as a racial group will vanish completely.”
             March of the Titans: A History of the White Race http://www.white-history.com/peril.htm 
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Arthur Kemp 10
British writer 1962Related quotes
                                        
                                         Collective Nouns, blog post http://www.arthurkemp.com/?p=140 
Quotes from other works:
                                    
Disme: the Art of Tenths, Or, Decimall Arithmetike (1608)
Essay on the Principle of Population (1798; rev. through 1826)
Source: The German State on a National and Socialist Foundation (1923), p. 81
The Construction of the Wonderful Canon of Logarithms (1889)
To Leon Goldensohn, February 28, 1946, from "The Nuremberg Interviews" - by Leon Goldensohn, Robert Gellately - History - 2004 - Page 280
The Aquarian Conspiracy (1980), Chapter Three, Brains Changing, Minds Changing