One must accomplish two things when earning a PhD. First one must understand a particular subject thoroughly. Secondly, one must extensively in knowledge about that 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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