The Death of the Republic
A bicameral legislature was established as the result of a Great Compromise that created two legislative houses with two different constituencies. This model created a system of checks and balances that helps to guarantee that the rights of the people will be protected against the tyranny of a majority or a minority.
The House of Representatives was created to give a voice to the people in all of the states and the Senate was a second house created to give the states a seat at the bargaining table.
Congress consists of two separate and distinct constituencies; they are the people and the states. Delegates from the states wrote the Constitution and created a federal government where the power was divided between the states and the people. The Constitution, contains a short list of powers which are delegated to Congress, the President, the Supreme Court. The Tenth Amendment states that all other powers "are reserved to the states respectively, or to the people".
One of the main purposes of the Senate was to provide the states with the ability to prevent Representatives in the House from violating the Constitution. The ratification of the 17th Amendment transformed our federal government into a national government.
With the direct election of Senators being mandated in the 17th amendment the states were no longer able to participate in the government that they had created. This amendment essentially created a Congress with two houses both representing the same constituency and the days of checks and balances and a bicameral legislature came to an end.
Ideally, all legislation should be introduced in the House of Representatives and it should be the responsibility of the Senate to decide if the legislation did not violate the Constitution.