The Articles of Confederation created a one-branch government consisting of a national legislature, called

Parliament.

the Constitution.

Congress.

the Northwest Ordinance.

Congress

Explanation:

The "Articles of Confederation" and Perpetual Union are considered to be America's first written constitution. It was an urgent need to address the wartime happening in 1777.

In order for alliances and treaties to be made, the Article of Confederation created a one-branch government consisting of the Congress (a national legislature). It allowed each state to have one vote. The Congress also held the power to declare war and to elect military officers in the government.

This kind of strategy weakened the central government because they didn't have the capability to impose taxes.

So, this explains the answer.