Why in the '70's and '80's they stoped manufacturing tv using USA Made components?

[Electronic M]

While American firms favored American parts we never had hangups using foreign parts. A number of American makers bought german power resistors during the Korean war due to the war causing parts shortages*.

During the 60's some makers sourced European and or Japanese signal tubes.

American CRT plants ran into the 90's, and domestic small parts making operations still exist.

*At that time we were also using American made resistors that had the right value for the circuit but the wrong color code labeled (ie off tolerance/factory seconds).