Why are third parties important in a political system? They oppose the strongest party. They participate in the debates. They have the largest number of voters. They propose new ideas and advocate reform.

They propose new ideas and advocate reform

Explanation:

While their candidates have little chance of being elected, America’s third political parties have historically played a major role in bringing about sweeping social, cultural, and political reforms examples are

Immigration Restrictions

The Immigration Act of 1924 came about as a result of support by the Populist Party starting as early as the early 1890s.

Reduction of Working Hours

You can thank the Populist and Socialist Parties for the 40-hour work week. Their support for reduced working hours during the 1890s led to the Fair Labor Standards Act of 1938.