When Progressives demanded major changes in workers' rights, who did it affect most?

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When Progressives demanded major changes in workers' rights, it affected Republicans first. During the Progressive Era, from 1900-1920, support for populist and worker interests greatly grew in the North. Due to the leadership of Teddy Roosevelt, the Republicans were the first to respond to the progressives' calls for reform to workers' rights on a national level. During Teddy Roosevelt's era, many progressive ideas were adopted, along with corrections for monopolies and trusts.

When Progressives Demanded Major Changes in Workers' Rights, Who Did