A PhD or Doctor of Philosophy is a postgraduate academic degree awarded by universities. Once one attains a PhD he or she may often be referred to as a doctor.
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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