One of the common criticisms of US citizens is that they are ignorant of the world outside of US borders. I would argue there's no better way to learn about the world than to travel to places outside of your comfort zone.
Of course, at some point, "Third World" became synonymous with "poor", and was euphemised to "developing".
[1] “Speech by Chairman of the Delegation of the People’s Republic of China, Teng Hsiao-Ping, at the Special Session of the U.N. General Assembly: April 10, 1974” (Peking: Foreign Languages Press, 1974).
I had assumed that kelukelugames meant the phrase in the European sense of the term, coined in 1952 by Alfred Sauvy (according to Wikipedia).
[1] On China
The Chinese Civil War where the Communists were funded by the USSR and the Kuomintang were funded by the US just finished 2 years prior.
There's likely to be a better source available to someone wanting to spend the time to find it.
Yea, and Switzerland was "3rd world" back then.