What plan suggested a two-house legislature for the national government?

The Virginia Plan.

Explanation:

It was proposed by the delegates from Virginia during the Constitutional Convention of 1787. It called for a two-house legislature for the national government elected according to the population in each State.

In response to this, and defense of the smaller States another plan was presented. The New Jersey Plan, it attempted to protect smaller States with less population and therefore less representation.

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