Zeihan stans regurgitating 101 Zeihan US strong PRC weak argument, and forget that in geoPOLITICS, the political component is as important as geography. Natural advantages can only do so much if they are squandered. Even Zeihan concedes this. Also some basic media literacy when evaluating his claims designed to sell expensive dinners to wealthy American exceptionalists. Rudimentary critical analysis like:

>US has more navigable river

Go do a search of country with most internal navigable water ways, it's PRC with more than 2x of US. This is basic tier fact check. US technically has a lot of exploitable waterways, but PRC has much more significant urban/manufacturing clusters linked via the waterways. Vs US waterways are primarily used for transport of bulky primary Ag goods... barge freight in US is massively underutilized because US is systemically bad at infra upkeep (drediging / maintenance etc). Politics > geography.

>has great ports on both oceans.

Has great port potential but poor quality ports due to inability to build infra and reliance on human labour. Go look at list of port rankings, PRC has 8 out of top 10. Like does it really matter US has deep water coasts to accomodate 10,000 world class ports when economics preferences consolidating large scale ports. Or that PRC infra capability can simply dredge out huge port projects at still fraction cost/time of US building on the most ideal site. Politics > geography.

>is self-sufficient in energy

Only on the most surface analysis. US is self-reliant in the sense it has resources in the ground that are economically exploitable. Versus PRC with massive imports to maintain production, implication being US can trivially choke PRC inputs via blockade/embargo (act of war)... by targetting shipping. Here is the reality, US is only as self sufficient as 130 vunerable refineries can process petro products which sustains everything including ag inputs. In event of war, which those musing US blockading PRC shipping forget actually will be, PRC can retaliate by compromising these refineries with cyber warfare, or in event of full escalation conventional hypersonics. There's a reason Biden told Putin/Xi that he considers cyber attacks on US infra comparable to initiating physical war. In age of vunerable networked infra nodes, during an actual shooting war, US is more vunerable and less self sufficient than EVER simply because adversaries like PRC has the capabilities to compromise critical CONUS infra. Like gunpower ended actual fortresses, network and conventional global strike capabilities ended Zeihan's fortress america. Politics (PRC indigenous defense drive) > geography.

>has horrible demographics

China actually significantly better off demographically TO COMPETE with US vs just about everyone else. Yes there's broad demographic decline, but S&T investements and academic reforms has massively grown the segment of educated / skilled talent. Huge population base effect = PRC generating something like 4.5M STEM talent with exploding pHDs, about all OECD combined. This is multitude more than US can generate domestically + immigration. PRC is only getting better demographically equipped to challenge US primarcy. Think of how JP/SKR/TW consistently moved up value chain, destroyed US lead in semi, even though most they had shit tier demographics but moved up value chain by converting new gen disproportionately into STEM. PRC is doing that with 20x more talent and will be going after every sector. What else does declining population imply? Less import dependancy and more strategic options. Politics (PRC investment in human capita) > demography. Granted does not negate, but there's demographic divident political hacks at PRC scale.

>large navy but only 10%
...
>US has kept shipping lanes open, and China relies on that to this day

This is whoefully out of date, PRC has been building mid-tier sized European navy every year, hulls of surface combatants are all blue water capable. But ultimately PRC simply choose not to take on global commitments and freeloads off the US... because why would they not. Apart from courtesy anti piracy, and foreign port visits, PRC likes to stay within IndoPac and turn SCS into Chinese lake. With PRC ship building capacity, it would be trivial for PRC to build a replenishment fleet comparable to USN and replace US policing duties, which would open up global basing options for others who want to freeload off PRC. Ergo US has to fulfill commitments or else they lose hegemonic competition/perks to others who are willing. Now go look at USN readiness / retention decline and the sad state of the fleet due to massive over commitment / tasking and ask yourself why PRC would stop an adversary while making mistake. Or circle back the PRC global hypersonic developments and translate that to port strikes, the TLDR is USN naval assets are single deployment assets, less if replenishment fleet gets scrapped.

>fairly hostile island nations with lots of antiship missiles

Zeihan was wanking about surrounding PRC with AShMs at a time when US policy / wonk writings thought this was a great idea (it is), but when US foreign policy tried implement said 1st island chain plan last couple admins, they found very few takers. TLDR is majority of ASEAN/region is neutral and no one is really suicidal enough to be PRC missile sinks in a Sino-US war. Right now the only takers is Japan, TW, and maybe SKR. And bluntly, if you look at current/trending force balance differential in region and future PRC military aquistions, PRC doesn't even need a navy to completely destroy major US ally in the region, who are all islands and existentially vunerable to import disruptions. Not to mention these allies are more liability in actual war... because PRC attacking them will trigger security commitment in 1st Island Chain where US does not want to fight.

>China has become a great economic power

This is peak US exceptionalism wank, China has become a great economic power because it exploited US failures in domestic and foreign policy. People want to think it's US benevolence when it's actually US incompetence that built modern PRC. There's a reason why US vs PRC competition is about systems and not just geographic blessings. It's not geography that's massively failing US, it's the politics. Whatever you think of PRC/CCP politics, so far it's closing the gap faster than US can contain.