The European and North American TV systems use different standards -- 625/50
and 525/30, respectively. You cannot copy from one to the other without
conversion at some point.

If the tape is PAL, you need a VCR that can output the image in NTSC format
(or something closely approximating it), which you would then copy to a VCR
that records in NTSC format.

If you would tell us more about the VCRs you have (make and model, specific
features), it would be easier to help you.