people on TV (american TV) are the standard by which I say I have no accent.
Californians, Pennsylvanians, Floridians, Arizonians......
In the US, there are (among others)the following accents:
starting in the north east:
New Englander,
Boston ( BAAAHSTAHHN),
New Yoooorker, (see Tony Danza) Jersey (Joisey, hot dooowg) (see also: Tony Soprano) Pa Dutch ( sounds like german...aka Yoni)
South East: Brett Favre, Elvis, etc.
Southern:
Texan twangy
Cajun
Minnesota, yah,.....
watch fargo, yah?
Middle American..... they say Pop for Soda, and have weird inflections.... listen to Elspode talk.... ( same thing going on in Pittsburgh)
I'm not really very familiar with Western accents..... Cicero, or Cloud or Lookout may be able to help.