Downvoted because I'm past being tired of this "yellow Peril" nonsense. Had my fill of it decades ago.
If you want criticize the C919 as you apparently do, try citing some meaningful criticisms instead of whining that they stole it all from us. Sure large part of the aircraft are foreign built. So what? Large parts of your car, computer, and appliances are almost certainly foreign built. Most sensible people. Even most Americans figured out that wasn't necessarily a problem when they discovered in the 1970s that not only were Japanese cars a bit cheaper than American cars of the time. But (thanks largely to C Edwards Deming) they were far better built. When Ford finally managed to put together an automobile comparable in quality to Toyota and Honda (the Taurus) in the mid 1980s, it quickly became the best selling car in America.
What do I mean by meaningful criticism. The C919 is many years late and much more costly than original estimates. $100M or so vs maybe $65M (original $50M adjusted for inflation). That's almost as much as purportedly comparable Airbus and Boeing offerings. Why would anybody other than a Chinese carrier buy one? Maybe they can get costs down. And maybe they can't.
And short term -- for the next five years or so -- there are two other issues. First, while the aircraft hasn't killed or injured anyone so far, it doesn't have all that many flight hours. It'll be a while before it has a meaningful safety record. Second. Even if you wanted one, Comac probably couldn't deliver it any time soon. They don't really have significant production capacity. And they won't for a while. They are said to hope to be shipping 150 units a year by 2028.
I think that at best, the C919 demonstrates that China might have or be building the infrastructure to design, qualify and produce decent airliners, Comac might be an Airbus/Boeing competitor in the (late?) 2030s or 2040s. Or not. Time will tell.