Final answer:
Post WWII, countries that were once classified as less developed were reclassified as developed nations due to worldwide economic growth.
Step-by-step explanation:
Post WWII, countries that were once classified as less developed were reclassified as developed nations. The worldwide economic growth observed after WWII led to the rapid reconstruction and development of countries like Germany, France, and Japan, which became economically developed countries themselves. Additionally, countries in East Asia, such as Singapore, South Korea, and Taiwan, also experienced significant economic growth and are now considered developed countries.