Do you mean US, North American or of the Americas in general? If either of the latter two then it has to be:
1) Trailer Park Boys
2) Trailer Park Boys
3) Trailer Park Boys
4) Trailer Park Boys
5) Trailer Park Boys
6) Trailer Park Boys
7) Trailer Park Boys
8) Trailer Park Boys
9) Trailer Park Boys
10) The Drunk and on Drugs Happy Funtime Hour or possibly Trailer Park Boys.
If you mean solely US then something like
1) The Larry Sanders Show
2) Sledgehammer
3) Seinfeld
4) M*A*S*H
4) Sgt Bilko
5) The Munsters
6) Taxi
7) The Beverly Hillbillies
8) Mr Ed
9) Married with Children
10) either Mork and Mindy, the Dukes of Hazzard or The Waltons
I'd like to include Laurel & Hardy, Harold Lloyd, The Three Stooges etc but they aren't really sitcoms, though, are they? Likewise, the Hair Bear Bunch, Captain Caveman, Hong Kong Phooey, Duck Man and all those other cartoons, like Dallas.
What'chu talkin' 'bout, Willis? I forgot to mention Diff'rent Strokes!!!