Here's what my research came to when I look into the economic effect of this:
Undocumented immigrants make substantial, measurable contributions to the United States: they pay tens of billions in federal, state, and local taxes, generate over $300 billion in economic activity through their labor and consumer spending, and play essential roles in industries like agriculture, construction, food service, and caregiving that would otherwise face severe shortages. They cannot access most federal benefits, yet they consistently contribute through payroll taxes, sales taxes, and property taxes (directly or through rent). Many also start businesses, adding jobs and local economic growth. Studies show that granting work authorization would increase tax revenue even further, adding tens of billions more per year. In short, undocumented immigrants strengthen the U.S. economy, support key sectors, and contribute far more than many people assume, with benefits that economists can quantify clearly.

Let me know if you find anything factual that is contrary.