Any such line is called a great circle. There are infinitely many of them.
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The Prime Meridian does not divide the Earth, it is an imaginary line going straight through the center.
bisect it
At the end of the line there needs to be two points. Measure the line and divide by two.
the line means to divide the two #'s
Any line of longitude (or of latitude, for that matter), that crosses the United States, will divide it in two.