The second "we" was all too happy, and still is, to buy cheaper products, even when apprised of the economic consequences. The third beneficiaries are businesses, for whom components and manufacturing are now vastly cheaper,
enabling further (taxable) wealth generation that could support the middle-class.
If the US had a sensible culture (and hence democratically driven government policy) behind education, a skilled labor pool could have emerged to develop high-tech manufacturing that leveraged China's low-skill labor pool. Instead, China has 'hid its strength, and bided its time', establishing its own high-skill labor pool and advanced manufacturing capability, giving it substantial leverage over the entire world, without so much as starting a proxy war, usurping foreign lands, assassinating foreign political leaders, etc.
US hegemony is absolutely its own to lose, but it all depends on the culture driving it.