Most United States citizens acquired citizenship by birth, but persons born in other countries may apply to become U.S. citizens. This process is called Naturalization
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Yes, all natural numbers are real numbers. Natural numbers are a subset of real numbers, so not all real numbers are natural numbers.
No. Natural numbers are a subset of whole numbers. Negative numbers are whole numbers but not natural.
All of the natural numbers.
Yes. All natural numbers are rational numbers.
All the positive real numbers are natural numbers.