This answer and the answers below ignored one simple point: 5G is a global collaboration (3GPP), not a regional experiment, which includes operators around the world and vendor around the world (not true, few from American..). You can basically call 3GPP the dictatorial organization, simply it is the only organization truely working on the cellular technique.

More importantly, it is getting stronger, and the ecosystem getting more diversified as more OTT and devices vendors like Google, Tencent, Alibaba, Apple, all joining in.

Face it, US is being left behind.