The supporting details that help to support the central idea of the paragraph are:
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After the Civil War and the emancipation of slaves in the United States, the Fifteenth Amendment, which would give African American men the right to vote, was proposed. This caused a great divide between women suffragists.
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Some women, including Stanton and Anthony, would not support the amendment because they felt that it should extend voting rights to all American citizens.
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Other women, including Lucy Stone and Julia Ward Howe, supported the amendment.
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They believed that once African American men had the vote, women would be next.
All these details illustrate the differing perspectives among women's rights advocates regarding the Fifteenth Amendment and highlight the divide it created among suffragists.