Why do American products not seem to be of good quality?

I know this might offend people, but me and my friend were talking about this on our trip to Costa Rica-products made by American companies aren't as high quality as people think. Listen, I don't hate the United States, so don't question my patriotism. I know quality products can be produced in the United States.
The reason I say this is because of my experience with many products from American companies that hasn't been positive. One example is cars. My family has owned many cars from Chrysler, Ford, and GM, and they weren't good at all. Buy American people love them and claim they're more reliable than Japanese and South Korean cars but that isn't my experience. The transmissions have all failed at about 100,000 miles on our Fords. Our GM cars have had electrical and engine problems. Don't even get me started on Chrysler. On the other hand, cars we've rented and owned from Honda, Hyundai, Nissan, and Toyota have all been built better and have been more reliable.
Next is electronics. All our cameras and TVs by American brands haven't been as good as our cameras from brands like Canon and Nikon and TVs from brands like Panasonic, Sharp, and Sony. My grandma's Polaroid TV has blotches on the screen that we don't have with our Samsung.
Last is airlines. I know an airline may not seem like a product, but, as I said, I recently went to Costa Rica, and I flew there on United Airlines. United lost my bag on the way there and back and the seats were uncomfortable, unlike Qantas.

Added (1). Also, about airlines, why does Qantas have a five star rating whereas most American ones like United only have three star ratings?

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All the american products are made in china or somewhere where they can be made with cheep low quality materials for a low price

When comparing quality of American products to quality of Japanesse products, the history of building quality into the product needs to be considered. Quality Control is a topic that was basically dismissed by American manufacturing during the 1950s as an unneeded process. On the other hand, the Japanesse considered quality standards to be important to the process. Dr. W. Edwards Deming introduced the theory of measuring a process to prevent errors instead of just fixing errors at the end. Many US companies didn't want to use these methods, so Dr. Deming introduced the methods to the Japanesse. At the time, the Japanesse were rebuilding their country from WW2 and seen this as a method to help improve the production of their products.

Basically, the Japanesse used Quality Control methods longer than the US. The US has been playing "catch up" for several years.