The reason why there is lack of unified currency under the Articles of Confederation cause problems for the new nation is:
One of the reason for the lack of unified currency as regards the Articles of Confederation is that, it impossible for the federal government to collect taxes to fund its operations.
The Confederation usually depends on the efforts of the states in getting money to fund central government.
We can conclude that reason behind lack of unified currency under the Articles of Confederation is it makes regulation of different currencies in circulation.
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