Vicki,
If you went to uni in the UK, you'd probably do better to get a few years' experience under your belt before trying to find a job in the US. US employers have trouble judging academic equivalents, but do better when it comes to evaluating on-the-job experience.

If you did a degree in the US, it would be somewhat easier to get a job fresh out of school in the US, just because the employers would "understand" what your degree meant.
Cheers,
Bev