Final answer:
The 'Address to the Niagara Movement' highlights the denial of political rights to the Black community by the American government.
Explanation:
The detail from paragraph 1 of the 'Address to the Niagara Movement' that best supports the conclusion that the American government is denying the Black community their political rights is: 'This sweltering summer of the Negro's legitimate discontent will not pass until there is an invigorating autumn of freedom and equality.'
- This statement emphasizes the lack of freedom and equality for the Black community, indicating a denial of political rights by the government.
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