Question

Which reason most closely illustrates why the national government was unable to maintain law and order under the Articles of Confederation?

There was no national court system.
State approval was needed to pass laws.
The nation had two systems of currency.
The government was unable to regulate trade.

Answer 1

There was no national court system.

Without a federal judiciary, the national government had no impartial mechanism to interpret or enforce national laws, settle disputes between states, or punish violations—so it could not reliably maintain law and order (as shown by things like Shays' Rebellion).