As a tangent to your comment, it always good to remember that big geopolitical decisions are never made in a vacuum, so when someone says “country X did Y because of Z” it usually misleading.
Some of the most fascinating reading I’ve done is the Pentagon papers because they go into exquisite detail about all of the thinking that resulted in the US’s involvement in Vietnam. It wasn’t just the Domino Theory, it wasn’t just containment of China, it wasn’t just getting France’s support for NATO, it wasn’t just Truman’s, JFK’s and Johnson’s efforts to look tough on communism.
Some of the most fascinating reading I’ve done is the Pentagon papers because they go into exquisite detail about all of the thinking that resulted in the US’s involvement in Vietnam. It wasn’t just the Domino Theory, it wasn’t just containment of China, it wasn’t just getting France’s support for NATO, it wasn’t just Truman’s, JFK’s and Johnson’s efforts to look tough on communism.
It was all that plus a dozen other things.