The intersection of 90 degrees W and 30 degrees N would be found in the state of Louisiana. It marks the location of New Orleans.
On I-71 just north of the center of Columbus, OH.
At 90 degrees west and 45 degrees north, you would be in the state of Minnesota in the United States.
South Dakota. Approximately 3 miles from Gettysburg.
Louisiana
You would be in the state of Arizona.
That would put you somewhere in Texas.
20000
North, 41 degrees.
43 degrees North 77 degrees West
Tallahassee
65 N 150 W is the Tanana Valley State Forest. The American State is Alaska.