Mexico is a part of North America [1]. What is less obvious is whether Guatemala, Belize, Nicaragua, etc, would fall into N or S America. Central America is a region, like the Middle East, but is not its own continent. Central America is a part of North America [2]. Nathan made a good point that the United Nations considers Mexico a part of Central America [3]. I wonder why [4].
Sear each side, flipping minimally. It should not take long for a crisp brown crust to form. Depending on the heat of your pan, it should take about 2-4 minutes (or less) for each side to finish cooking. When the first side is done, flip your steak and cook the second side for about as long.
Rub a tablespoon of butter all over the side of the steak. Turn the steak over and repeat with the dry mustard, pepper, and butter. 3 Heat a large cast iron frying pan on high heat. Sprinkle both side of the steak with salt (unless you have used salted butter, then you can skip the salt.) Place steak in hot pan. Let sear for 2 to 3 minutes until well browned. Use tongs to lift up to see if nicely browned. If so, flip to the other side and let sear for 2 to 3 minutes. Remove the pan from the heat and let the steak continue to cook for 5 to 10 minutes in the residual heat of the pan (assuming you are using cast iron, if not, lower the heat to low).