Question

what made changing, or amending, the articles of confederation particularly difficult? only the president could propose amendments. amendments needed the approval of all thirteen states. amendments required a simple majority to pass. amendments were not allowed under the articles.

Explanation:

The Articles of Confederation had a high bar for amendments, requiring unanimous consent from all 13 states. This meant any single state could block a proposed change, making amendments extremely difficult to pass. The other options are incorrect: the president did not exist under the Articles, amendments did not need just a simple majority, and amendments were allowed (though hard to enact).

Answer:

Amendments needed the approval of all thirteen states.