The reallocation of congressional seats among the states every ten years, following the census, is known as

Congressional apportionment

Explanation:

Congressional apportionment is the process of apportioning seats in the United States House of Representatives among the 50 states every 10 years after the census by the United state constitution. This process involves dividing 435 memberships among the 50 states based on their population. Each state most have one member of the house of representatives, while the remaining 385 seats would be shared among the states by a formula adopted by the congress.

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