How did the Articles of Confederation prevent the central government from promoting the needs of the new nation?

By giving more power to the states rather than the central government.

Explanation:

The Articles of Confederations were made when the founding fathers still have little experience in politics.

At first, they made the state to have more power than the central government to prevent the new nation from turning into a tyrannical monarchy like the British empire.

But when they're implementing it, they soon realized that lack of strength in central government only making it impossible for them to control the states that wanted to create disruption to another states. This was the reason why they proposed several ratifications to the articles.

most cajuns resided in acadiana, where their descendants are still predominant

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