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The day the United States loses the ability to deport noncitizens who espouse such toxic beliefs is the day the United States ceases to be a sovereign nation-state.

The Trump administration has repeatedly insisted that giving Ukraine too much support would hamper a potential deal with Russia, while Zelenskyy and some of Ukraine's European allies have argued that Ukraine's survival as a coherent nation-state cannot be subject to bargaining.

John Skrentny, a sociology professor at the University of California, San Diego, believes that, though birthright citizenship or jus soli is common throughout the Americas, "each nation-state had its own unique road to it".

However, Mr Skrentny argues that what almost all had in common was "building a nation-state from a former colony".

"They had to be strategic about whom to include and whom to exclude, and how to make the nation-state governable," he explains.