What are you using as a your definition of developed? There are urban, developed parts in all those countries, as well as rural, undeveloped areas with no/few humans in the United States.
Developmental indicators like HDI, childhood mortality, access to clean water (not a right in Italy until 1996), etc.
If Italy in the 1990s was a developed country, then a lot of countries treated as "developing" today are actually developed, hence why I gave the examples of Turkey, China, Malaysia, Serbia, Russia, and Thailand - countries that are "developing" yet have sustained developmental metrics comparable to Italy in the 1990-2005 time period.
G7 was created by the then 7 largest Oil importers in the aftermath of the 1973 oil crisis. While it has connotations as a developed countries group, the reality is that Italy's developmental indicators lagged compared to much of Western and Northern Europe until the 2000s.
If Italy in the 1990s was a developed country, then a lot of countries treated as "developing" today are actually developed, hence why I gave the examples of Turkey, China, Malaysia, Serbia, Russia, and Thailand - countries that are "developing" yet have sustained developmental metrics comparable to Italy in the 1990-2005 time period.