What American accent do you have? Midland
("Midland" is not necessarily the same thing as "Midwest.") The default, lowest-common-denominator American accent that newscasters try to imitate. Since it's a neutral accent, just because you have a Midland accent doesn't mean you're from the Midland.
Above are my results from this quiz, which purports to diagnose the regional origins of your personal speaking accent (mine's off by about a mile). Apparently, I have no accent, which my friends from New York, California, and Chicago would almost certainly dispute. Take the quiz to find out which part of the American dialectical landscape you call home. Extra points if you aren't actually from the United States but can convince the quiz software you're a Yank.