Question

a weakness of congress under the articles of confederation was that it could not conduct diplomacy. print or issue currency. collect taxes. declare war.

Explanation:

Under the Articles of Confederation, Congress had several limitations. It could conduct diplomacy, print currency (though there were issues with its value), and declare war. However, a key weakness was that it lacked the power to collect taxes directly; it had to rely on states for revenue, which often led to financial problems. The other options were powers Congress did have.

Answer:

collect taxes.