http://library.uwb.edu/Static/USimmigration/1917_immigration_act.html
http://www.eugenicsarchive.org/html/eugenics/essay9text.html
http://www.indiana.edu/~kdhist/H105-documents-web/week08/naturalization1790.html
https://en.wikipedia.org/wiki/Immigration_Act_of_1924
https://en.wikipedia.org/wiki/Life_expectancy
https://history.state.gov/milestones/1921-1936/immigration-act
https://www.breitbart.com/politics/2019/03/12/exclusive-donald-trump-accuses-tech-giants-of-colluding-with-democrats/
https://www.indy100.com/article/usa-american-army-invasions-police-actions-overseas-dod-defense-war-troops-deployment-marines-7908611
https://www.nytimes.com/2019/03/05/us/border-crossing-increase.html
https://www.ourdocuments.gov/doc.php?flash=false&doc=47