Detroit
Niagara Falls
There is not CLOSE border crossing between Texas and Canada, but you probably go through Detroit.
Assuming you mean "Toronto", Ontario, and assuming you mean a border crossing into the USA, try Fort Erie/Buffalo.
The nearest U.S. border crossing at Prescott, Ontario/Ogdensburg NY. Or at Cornwall - Massena or St. Regis, NY.
260km or 3 hours drive or 161 miles to the closest border crossing is at Carway directly south of Calgary.
That is easy to answer! There are absolutely no oceans in Pennsylvania. In fact, no oceans exist "in" or inside any State of the United States. The closest ocean to Pennsylvania is the Atlantic Ocean, but it does not touch Pennsylvania.
Prescott-Ogdensburg Border Crossing
Pennsylvania and New Jersey border each other, separated by the Delaware River, for (as far as I can tell) the entire border. It looks like the shortest bridge crossing is slightly less than 0.1 mile. (about 100 meters)
No. The closest Six Flags to the Pennsylvania border is Six Flags Great Adventure in Jackson, New Jersey, and Six Flags America is just outside of Washington, DC.
New York, New Jersey, Delaware, Maryland, West Virginia, and Ohio are the closest states to Pennsylvania, because they border it.
Karni border crossing attack happened on 2005-01-13.
Pennsylvania is a land locked state and the Atlantic Ocean does not border it.