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"Calling this a crisis, saying it's real. That's a shift I think," says demographer Anna Rotkirch, who has researched fertility intentions in Europe and advises the Finnish government on population policy.

As a demographer who has looked at population data for decades, Johnson said this year’s difference between the Census Bureau and California Department of Finance estimates was remarkable.

"As a demographer, I don't think states should be overly concerned about these issues. They can be resolved through constructive negotiations between federal and state governments," says Mr Goli.

“But I will say that Michel is a very careful demographer and he wouldn’t just make one up.”

Significantly, the map displays what demographers have previously noted: Unlike other major American cities, L.A.’s racial and ethnic groups are more likely to encounter each other because we don’t huddle with just our own.