Talk:1920 U.S. Census

Is there a quoted source where this total population number came from? The US Census Bureau shows it to be 105,710,620. If we add the Census Bureau's accounting for Alaska and Hawaii, the total grows to 106,021,568. Further, is there some reason why we are excluding the counts from Puerto Rico, American Samoa, Guam and the US Virgin Islands? Excluding the Philippines is understandable since it is a very large number and isn't really helpful in explaining the growth of the US historically (since the Philippines were granted independence from the US in 1946).