Among the nations you listed, South Korea would be considered a developed nation.
Here’s a brief overview of the others:
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Libya: Although it has a relatively high income from oil resources, it does not meet the overall indicators of a developed nation due to its political instability and lower human development index (HDI).
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China: While it has one of the largest GDPs in the world, its per capita income is lower compared to developed nations, and it is often classified as a developing nation.
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Mexico: It has a growing economy, but it is generally considered a developing nation with challenges related to income distribution and overall human development.
In contrast, South Korea has a high GDP, high per capita income, and a strong infrastructure and education system, which are characteristic of developed nations.