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The 19th Amendment to the United States Constitution is significant because it specifically granted women the right to vote. Ratified in 1920, this amendment marked a pivotal moment in the women's suffrage movement, which had been advocating for women's voting rights for many years. The adoption of the 19th Amendment ensured that the right to vote could not be denied on the basis of sex, thus enfranchising women across the country and promoting greater equality in the democratic process.

In contrast, the other amendments mentioned focus on different aspects of voting rights or government structure. The 15th Amendment prohibits the denial of the right to vote based on race or color, but it does not address gender. The 21st Amendment repealed Prohibition, while the 25th Amendment deals with presidential succession and disability. Each of these amendments plays a crucial role in the U.S. Constitution but does not pertain to women's suffrage like the 19th Amendment does.