Based on the timeline, the true statement is:
More than 70 years after Seneca Falls, women gained the right to vote in all states.
Here’s why the other statements are not accurate:
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In 1900, women were not allowed to vote anywhere in the United States. This statement is not true because, according to the timeline, women were granted the right to vote in the Wyoming territory in 1869 and later in Colorado, Utah, and Idaho between 1893 and 1896.
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Women and African American men were both granted the right to vote in 1870. This statement is misleading because while the Fifteenth Amendment was ratified in 1870, it specifically guaranteed African American men the right to vote, but women did not gain the right to vote until 1920 with the Nineteenth Amendment.