A two-house legislature is called a bicameral legislature; the United States has a bicameral legislature. The bicameral legislature of the United States has two divisions: the Senate and the House of Representatives.
The legislative branch is one of the three branches of government. The Senate comprises 100 senators, two from each state. The House of Representatives contains 435 representatives, with the number of representatives coming from each state reflecting the population of that state. This type of legislature is the result of a compromise between the Founding Fathers who wanted each state to have an equal say in government and those who wanted larger states to have more of a say in enacting laws. Together, the Senate and the House make the laws.