The Federal gov't consists of representatives chosen by vote.
Illegals cannot vote, but their number increases a State's number of reps in the House. States will a larger percentage of citizens, but smaller populations have less representation.
Why should a State with a greater % of illegals have a larger voice in the House than a State with a larger % of citizens.
Do States with large illegal populations gain a voice for them in the House, a place where they cant vote? Actually, yes. Illegals cant vote, but they create more House votes because of their presence. In an odd way, illegals do vote...
Civics taught that the Constitutional amendment to make Senators selected by the public harmed States. The Federalist Papers provided great instruction about the balance of the House (the people and the purse) and Senate (the State gov't's voice). The States had equal power in the Senate to counter high population States in the House. The South needed the 3/5ths as their Northern brethren had large populations.
So, more House reps but the Senate remained equal. So, when the Senators became elected officials by the public, the only hedge against the high pop States was gone.
After the amendment, the largest populations now dominate the Congress. IMO, the States were wrong to give up their voice in the Congress. Senators don't represent the State govt. They are just two more members of the House.
The highest populations now get more in the House, the Senators ride those voters to keep their jobs, and you have a rubber stamp Congress: screw the States as they have no defense from the Fed.