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https://imigracaohistorica.com/2017/04/25/the-first-mexican-border-wall-was-actually-to-keep-out-chinese-people-the-exclusion-act-was-the-beginning-of-blocking-by-ethnicity-by-harmon-leon/
"The first Mexican border wall was actually to keep out Chinese people. The Exclusion Act was the beginning of blocking by ethnicity", by Harmon Leon