The way region locking works is that you have a console based in an area (E.g. "USA) and a game that is based in an area as well (E.g. "NTSC-J", which is used a lot in asia). However, the final thing that is a part of it is the game itself - that determines whether or not the game is region locked.
For example, I have an Xbox Live account based in Hong Kong. I can buy games from outside hong kong, or buy NTSC-J games, but it depends on the game itself whether it is region locked. For example, an NTSC 'Ghost Recon Future Soldier' I bought in america didn't work at all, but an NTSC-J version did. However, Halo 4, I bought a 'PAL' version, but because just about every Halo game is NOT region locked, I could freely play it.
And another thing.......
"All Xbox One games are not region locked." "Xbox One is a region free console." Microsoft clammers.
So, YES, you can buy a US version. However, before you do so, I would highly suggest looking around for a version that ISN'T in local voices, but rather have something like 'English and _______ Texts (English Voices)'. If you can, buy it online as well, but MAKE SURE it isn't in local voices - and your final option is to buy a US Version.