basically, if your DVD player will let you set it to be a particular region - 1 in this case, then theres no problem, and these discs will work fine (assuming your TV can play American format NTSC signal!).
If your DVD player is set to 'region-free', but you can't set it to be a particular region, then these will probably not work.
If your DVD player is set to 'region-free', but you can't set it to be a particular region, then these will probably not work.