The use of "poll taxes" as a means of racial discrimination was most effectively stopped by which of these methods? a) executive order b) congressional law c) supreme court ruling d) constitutional amendment

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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