A PhD is the abbreviation for Doctor of philosophy. This degree is a post graduate program delivered to a high level student researcher who has done deep research in a specific field or subject.
The United States of America is a large country in North America, often referred to as the "USA", the "US", the "United States", "America", or simply "the States". American colleges are funded by "tuition" charged to the student, which is often quite expensive, very commonly reaching into the tens of thousands of dollars per year.
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