The major reason why the lack of unified currency under the Articles of Confederation caused problems for the new nation was:
According to the given question, we are asked to state the major reason why the lack of unified currency under the Articles of Confederation caused problems for the new nation.
As a result of this, we can see that because of the lack of unified notes, the government could not collect taxes which were necessary to maintain their military and the economy also suffered as a result.
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