The allusion is established when King makes a reference to Thomas Jefferson and it can strengthen King's arguments.
King shows that his stance on fighting for civil rights is similar to Jefferson's stance on fighting for American freedom. Since both belong to oppressed social classes and had innovative and rebellious ideas that would change the entire social construction.
In doing so, King equates himself with Jefferson and allows the reader to understand that if Jefferson is defended by American society, King must also be, otherwise the concepts of racism and prejudice will prevail, as King points out.
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