We can define the reasons that why United states have a bicameral congress in historical, practical and theoretical way. If we look at the historical reason we see that the British Parliament had consisted of two houses since the 1300s, and if we see practically, the Framers had to make a two-chambered body to settle down the conflict that is between the Virginia Plan ( in this plan, there are two houses of congress and the population will determine the representation in each house) and the New Jersey Plan (in this plan there is a single house of Congress and each state would have an equal vote) at Philadelphia in 1787 and theoretically the farmers preferred a bicameral congress in a way that one house of congress would have check on the other house.