DVD will work in USA?

Only if the DVD player in the US is "region-free" which it very well may not be. I learned this the hard way about 20 years ago.

Look up the specs for your DVD player.

If it's NTSC, that's North American standards. It also says "all regions" so it isn't limited to any particular region. Should be fine, as long as your player plays DVD9 format, which it should do, unless it's really ancient possibly.

Agreed. "All regions" should be "region free". But they are not the same words and some weasel might have twisted them.

But yes, it's a good bet.

The DVD standard seems to be up to DVD10. Don't know how recent DVD9 is but you might need a newer DVD player. But it won't be locked to a region.

https://en.wikipedia.org/wiki/DVD

DVD compatibility usually comes down to region codes and the player, not the country itself. Most US players are Region 1, so Region 2 European DVDs won’t play unless the player is region-free. I’ve traveled with discs before and the easiest fix was a cheap region-free player. TVs don’t matter here, it’s all about what the DVD drive allows.

Some time ago I read that DVD players designed for use with iMacs would play foreign DVDs. I have not done any research on the topic. It's possible that information is incorrect, or that it used to be true but no longer is.

I bought a cheap DVD that I could reprogram to play European regional disc. Your regularly American DvD won’t play this.