Becos the american look down on Chinese space technology 20 years ago. While US need to depend on Russia space technology like RD-180 engine and need Russian technology to make the ISS main core module.Stop trolling Indians.
Anyway CONGRATS TO CHINA. Another leap for mankind in space. We should all join hands to explore space, since we haven't even scratched the surface of our solar system exploration, instead of useless ego/infightings. At least space should have been a unifying force for mankind, but politics as always is involved in everything between countries. On this note, i will agree that it's the fault of the U.S on this one for limiting cooperation with China in space, i fail to understand why, since they already do so with Russia. Anyway, we Europeans are at least always open to cooperation and have been involved/cooperated in many of China;s space projects, which is a good thing and helps build trusts. It will be the same with this space station.
Funny enough it's due to US policy that forced the Chinese to develop everything themselves from their own GPS to space station to mars mission. If not for US policy they wouldn't have done this alone, since they would have been more involved in cooperation's/joint projects under NASA/European space agency. Anyway, that's in the past, we have to look in the future, hopefully, it will be more about cooperation in space than otherwise.
20 years ago, Russia is not lacking in space technology but funding only.
American are too arrogant and think China space can't advance rapidly by Chinese own effort.