Trek, Specialized and Cannondale all manufacture in China. Waterford and Vanilla don't make electric bikes. Even Stromer, with $10k bikes, only does final assembly in Switzerland with Chinese components.
Maybe you meant that historically-North American-branded expensive e-bikes (with in person support at local bike shops) vs. came-out-of nowhere brands with poor support and great prices? [Schwinn, Cannondale, GT & more are owned by Chinese conglomerates]
The middle path seems to be smaller North American aggregators/assemblers that sell direct or to bike shops that aren't tied to big-Co. exclusives (if thou wants to carry Specialized, thou shalt not carry XYZ) such as Rad Power and Juiced.