During 1787 different delegates of the government joined forces at the Independence Hall, to reach to a historical agreement. Named after Connecticut delegates Roger Sherman and Oliver Ellsworth, the Connecticut Compromise stated that the United States was going to have a dual system of representation in the Congress.
This is to say that in the Senate, all the states were going to have the same number of representatives. Meanwhile in the House of Representatives each state would have a different amount of members, depending on the size of its own population.