The articles of confederation created a one branch government consisting of a national legislature, called

Congress

Explanation:

The Articles of Confederation (1781) created a weak central government consisting of a national legislature only called "Congress". Under this Constitution, Congress had a few powers, some of them included the power to declare war (even though it wasn't authorized to draft soldiers), appoint military officers, sign treaties, make alliances, appoint foreign ambassadors, manage relations with Indians, and raise money only by asking the states for funds (which had the option to reject the request), by borrowing from foreign governments, or selling western lands.