A single laptop has likely hundreds of processing units, running unknown software, often with direct access to the memory buss. Building a secure devices however where every bit of code and every bit of hardware is designed domestically (and preferable in house) is so prohibitively expensive that no one do that. The hope is that if there is a security fault then someone else will find it and report it, and so a reputation system is the only economical viable method for hardware security in most consumer devices.
Edit: Quite a lot of high end cpu are now done in Taiwan TSMC, they caught up to US capabilities. But most of intels cpu's are still made in US.
[0] https://www.bloomberg.com/news/features/2018-10-04/the-big-h...
By the way, they never provided any proof and even better, claimed that their laptop broke when pressed.
Edit: this too? Mob mentality here. Sad. Lol if this is being downvoted I have some words for you.