American DVD:s are Region 1, European DVD-players require Region 2. However, most DVD-players can be hacked to region-free, meaning that they accept any region code. Some players are region-free already when sold. I ordered my Happy Days DVD-set from Canada and hacked my European DVD-player. Works beautifully. All it took in my case was to download a small file, burn it on a CD and insert the CD in the DVD-player. That was it.
Check this and see how to hack your player: