The Commerce Department’s plan to add a citizenship question to the 2020 Census will likely lead to an undercount of non-citizen US residents, say experts. And this projected undercount will have a higher negative impact on congressional seats and state funding in states that are more highly Democratic. Lisa Neidert’s apportionment calculator is used to illustrate how changes in Census counts for state populations are reflected in the distribution of house seats – and ultimately the distribution of power and funding at the federal level.

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