In China, you can get a VW ID.3 manufactured by a state-owned and subsidized company in China. The same is true for the Tesla Model 3.
Basically, the Chinese government is subsidizing electric car (and battery) production (and enforcing domestic protectionist policies) so of course the same version of the car is cheaper in China. The US goes with a different approach, by providing tax write-offs to people who purchase electric cars which is vastly less efficient (and more expensive to US taxpayers).