Final answer:
Minor parties impact US politics by influencing major parties to adopt their ideas and bring attention to important issues.
Explanation:
Minor parties have contributed most to United States politics by causing major parties to adopt their ideas, bringing attention to important issues that major parties overlook. For example, the Progressive Party's support for women's suffrage led to the passage of the Nineteenth Amendment. Third parties can act as catalysts for change and influence policies enacted by major parties.
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