[marbren]

Is there any way China could destroy our economy?

[JasonC]

Short of suicidal nuclear attack, no. If they were willing to lose hundreds of billions themselves, they might cause modest temporary disruption by dumping their dollar holdings on the market all at once - but if intentional, hostile, and known, the Fed could simply take every scrap of it without breaking a sweat, and reduce the pile as gradually as we please and on our own chosen timing. So no, not really.