Mr Duffy's comments about the potential for China and Russia to potentially "declare a keep-out zone" on the Moon appear to be referring to an agreement called the Artemis accords.
Because immigrants are likely to be of working age and employed, they also paid nearly $100,000 more in taxes than the average native-born American, the study found. In their absence, national debt would reach approximately 200% of GDP, rather than the currently estimated 120%.
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