China does not have more cultural unity, it simply has more of a stomach for suppressing minority or rebellious subcultures. See: Tibetans, Mongolians, Hong Kongers, Uyghurs.
The Tibetans are a great example. Both the Mongolian and Manchurian descended rulers had left Tibet as an autonomous region primarily because the rulers themselves were Buddhist. However, the Qing dynasty had asserted state power over the theocratic rule of the Tibetan lamas, including changing how the tulkas (such as the Dalai Lama) were identified and selected. That all happened in mid-1800s.
The contemporary assimilation of Tibet comes from well-used playbook the Chinese have employed:
1. Suppression of the written language and standardizing on the same written script
2. Suppression or assimilation of cultural symbols and ideas
3. Imprisonment or subornment of cultural leaders (such as the monks and nuns, or if you read this whole drama: https://en.wikipedia.org/wiki/Dorje_Shugden_controversy ... the main protest organization got shut down when allegations of funding from the Chinese intelligence apparatus came out)
3. Colonization by assimilated groups
4. Creation of economic and trade ties (such as the railway that was built all the way to Lhasa).
Every year, Tibet is less and less Tibet, and more and more Chinese.You can actually see some of this going on, if less aggressively, in Africa. China, after all, have a rich history in developing and maintaining vassal states.
These are things the US is not willing to do. And I am not saying that it is ethical or moral. The result though is that China has far greater cultural unity than the US currently has.
US government does not need to do this explicitly.
US culture outreach is effective and efficient. Prior to 2008 financial crisis, Chinese common wisdom places US superior to Chinese in every aspects. You can put Xi in that period, and see how ineffective his ambition can be implemented.
It was only after US culture outreaches have been intoxicated by self-righteousness and a chronicle ineffectiveness, think about the Arab Spring and the 2016 election debacle, and the TikTok deal, and the disastrous Covid response.
Government directed culture assimilation is always the least effective. That's used only when the civilian system is weak. In Mao's era, they dont need this, the civilian system is so effective in assimilating proactively across the whole nation. Think about the havoc by Mao. Mao can do that, because the society is utterly centered around his ideology. Precisely that the time, it was the government that is ineffective in counteract the population's attachment to a demi-god.
However, I don't think a cohesive will in the populus will emerge anytime soon. We have at least two major factions talking past each other here in the US (along with a lot of other points of contention: https://www.ribbonfarm.com/2018/03/06/a-quick-battle-field-g...)
An interesting period to consider is that of the Ming dynasty. They were expansionist up until a point, and then they turned inwards. Recalled their expedition fleets. Expanded the Great Wall. They were shutting down steel foundaries at a time when the European colonialism was getting started. It reminds me (at least superficially) much of US today. A narrative of why the Ming turned inward has been subject to a lot of discussion, particularly since they had the economic and technological might to preempt the industrialization of Europe.
(But I think it is also histories like this gets the Chinese thinking about their perceived rightful place as the world's leading superpower).
Huh? First Manchuria equals Qing in my limited remembrance of imperial history. Second, the Manchurians were Buddhist?
I am also not saying all of the ethnic Manchurians were Buddhists. I didn't get that deeply into the history.
I do know that the Mongolians greatly respected the tulkas of Tibet, with branches of the Tibetan Buddhis monastaries found in Mongolia. The search for reincarnations also extends out into Mongolia. The review mentioned that -- during the Song dynasty, the Mongolians let the Tibetans have enough autonomy to concern the Hans, and politically, they were seeing if the Qing emperors will do the same. The creation of the Golden Urn lottery system was a way to assert state power while also respecting the religious process in Tibet. (Whereas, in contrast, I think the Chinese selection of the Pachan Lama and control of the "tulka" was done as part of the cultural assimilation and oppression program by the Chinese). But yeah, the impetus for the Chinese conquest of Tibet in the twentieth century was centuries in the making.
But people probably were so indulged in mainstream media's reporting that, this hardly register to anyone as significant.
But that is just on the surface. What may not be as well-known are asymetric weapons platforms that are cheaper to operate and have been demonstrated effectiveness against larger naval vessels, within the US's own military war game exercises. In the last one, the oppositional team had been able to use such platforms to defeat their larger opponents, to the point that the exercise was cancelled. China has definitely been developing those weapons platforms. (I think the US has been as well, but the US also need to maintain the facade that the carrier groups are the premier projection of power).
Furthermore, the cultural aspects are eroding. The US military is a voluntary service organization, which has been the leading explanation of why the US can field multiple carrier groups, and no other country could. However, training and operational fitness has been eroding. This is what lead to the several naval disasters a couple years ago. They threw the commanding officers under the bus, but the deeper causes are (1) erosion of quality training for ship handling and (2) the personnel are running ragged, where normal ship operations are being affected (let alone what that says about their ability to operate in wartime conditions). This all happened within the US 7th Fleet, that operates within China's sphere of influence.
It's just as well that US pressure on China is being exerted through a trade war instead of military positioning.
(I also have had talks with friends about space-based kinetic weapons platforms, which, if fielded, changes the game dramatically in favor of the US).
As far as China's economic and technological power in the civilian sector ... There is a lot of advantages there. Probably the biggest thing is that China has cultural unity, greater economic optimism, and a cohesive will of the populous to catch up and displace US as the leading world superpower. The US, in contrast, is wracked with a culture war, and 70 years of policing the world and 30 years of trying to maintain the post-Cold War liberal order has left a very tired, pessimistic country.