Why did the delegates draft a new plan instead of revising the articles of federation?

Some thought that revising it still wouldn't make the national government strong enough. They needed to draft a new plan that gave the national government more power yet kept it from getting too strong with checks and balances.  

Explanation:

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a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

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