Peace for who? Like just look at the last 50-70 years of US intervention in LatAm. Backing a series of coups and extremely violent right wing dictatorships.

The issue is one of incentives. The US needs cheap foreign labor because of deindustrialization policies in the 60s and 70s. These were arguably passed as a check on labor power since socialism was still looking potentially ascendant at the time. Whatever the reason though, the contemporary US is reliant on keeping foreign wages down and domination of the oil trade. Imperialism grows out of this need for external resources to maintain economic growth. It would be less relevant to us if we had better fundamentals, but we traded those away to avoid letting certain demos get wealthy and powerful.

China's play is more mercantile. They benefit most from stable trade conditions. They get richer the more customers they have. They benefitted massively from becoming an industrial trade partner with the US in the 60s and 70s. Because of this, they have completely different foreign policy objectives. All they need to do to win is normalize relations and build trade infrastructure. Its way cheaper than imperialism.