I agree with you. Most US manufacturers use foreign parts:

Global supply chains
American manufacturers use a global network of supply chains to produce everyday products, including computers, cars, clothing, and furniture. Many of these products include parts and materials imported from foreign countries.

Automobiles
The US motor vehicle parts industry has become more international, and domestic carmakers rely more on imported parts. US regulators track how "domestic" every car is by measuring the percentage of each vehicle's parts and manufacturing that comes from either the United States or Canada.
Other industries

Even in other industries, US manufacturers often use foreign parts. For example, only a small portion of the total manufacturing costs for some products may be attributable to foreign processing, but that processing may represent a significant amount of the product's overall processing

icymi