Because it isn't america.geography, it's america.gov, and everyone who isn't playing dumb knows exactly what government that refers to.
Not to mention the only context you ever hear people using America to refer to both South and North American continents is people complaining that it should be only used in this way.
Not to mention the only context you ever hear people using America to refer to both South and North American continents is people complaining that it should be only used in this way.