The Tenth Amendment clearly smandates that the Federal government only has the authority granted to it by the states. Any power not delegated to the Federal government is reserved to the states, Any power not enumerated in Article II Secton 8 is strictly prohibited.
The power to organize the legislatures of the states is one of the powers reserved tto the states. The Federal government is prohibits from exceding the delegated powers.
49 of the 50 states decided on having a bica,eral legislature with one house to represent tje people amd a second house to represent the counties. The state of Nebbraska decided to have a unicameral legislatire and the Federal government had no authority to compel them to reorganize their state's legislatures according yo opinions of the Supreme Court.
The Supreme Court decison of Reynold v Sims and Baker v Carr were outisde of the jurisdiction of the Supreme Court.
Each state has the Constitutional authoruty ro choose the manner in which the members of the two would be chosen,\
Following the model of the U.S. Congressional the people would be propotionately represented in theHouse and the states would be equally represented in the Senate.
This same model was used by the states to create their bicameral legislatures.If the states created one legislative body to represent the people and a second houde to qully represent the counties,
Places and Manner of holding Elections for Senators and Representatives, shall be prescribed in each State by the Legislature thereof; but the Congress may at any time by Law make or alter such Regulations, except as to the Places of chusing Senators.