The Articles of Confederation created a confederal government in the United States. They did so because Americans were afraid of a strong central government such as Great Britain had.
During the end of colonial times, the colonists had felt that the British central government was too distant from them and too strong. They felt it did not understand or care about their needs. It then imposed policies on them (because it was strong) that harmed them.
When they became independent, the colonies (now states) wanted a form of government that would be the opposite of what Britain had. Therefore, they created a confederacy. This is a type of government in which the states have most of the power. The states only give to the national government whatever powers they want it to have.
Thus, the Articles of Confederation created a confederal system with a weak central government because Americans feared what a strong central government might do