What nationalities have dark skin?
People of Asian, African, Caribbean, and South American descent generally have darker skin tones than European Caucasian models, but not always. By this definition, we all have ethnic skin, driven by tribal gene pools, from pale Nordic to ebony equatorial.
From his research, he's found that people from Senegal and the islands of Micronesia have some of the darkest skin tones in the world. That's typical in countries close the equator, where the dark pigment melanin protects against UV damage from the sun's rays.
This makes the Inuit population an exception of the latitude-correlated distribution of skin color. One possible reason is that the dark skin could protect the Inuits from the severe UV exposure because of the long daylight hours in winter and high levels of UV reflection from the snow.
From about 1.2 million years ago to less than 100,000 years ago, archaic humans, including archaic Homo sapiens, were dark-skinned.
The most frequent skin color coded was white with pink undertones, which comprised 42.3% of the anatomical images. The second most prevalent color was pinkish brown, at 29.1%.
Melanin gives the skin its color. In certain conditions melanocytes can become abnormal and cause an excessive amount of darkening in the color of the skin.
Italian skin tone is also commonly referred to as olive skin or Mediterranean skin. It can also be described as having a tannish, or light-moderate brown hue.
Light skin is most commonly found amongst the native populations of Europe and Northeast Asia as measured through skin reflectance.
African and Indian skin had the highest total amount of melanin in the epidermis (t-test; P < 0.001), with no significant differ- ence between them. Amongst the remaining lighter groups, there was no significant difference in total epidermal melanin content.
The most lightly pigmented (European, Chinese and Mexican) skin types have approximately half as much epidermal melanin as the most darkly pigmented (African and Indian) skin types.
Which nationality has best skin?
Japan, China and other countries located in Asia have a rich diet of vitamins (specifically A and C, which benefit skin elasticity) and minerals including antioxidants from fruits and green tea.
African skin displays a greater convolution of the DEJ and a higher papillary fibroblast activity. These findings reveal that differences between African and Caucasian skin do not only affect upper epidermis but also dermal functions and dermal-epidermal cellular interactions.

References
- https://pubmed.ncbi.nlm.nih.gov/11936268/
- https://www.npr.org/sections/goatsandsoda/2016/11/20/501152390/how-khoudia-diop-learned-to-love-her-dark-skin
- https://en.wikipedia.org/wiki/Human_skin_color
- https://news.iu.edu/live/news/27840-diversity-of-skin-color-skin-tone-lacking-in-sex
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5502412/
- https://www.ahwatukeeskincare.com/post/which-country-has-the-best-skin-in-the-world
- https://pubmed.ncbi.nlm.nih.gov/19469898/
- https://skinsight.com/health-topics/ethnic-skin-types
- https://www.mountsinai.org/health-library/symptoms/skin-abnormally-dark-or-light
- https://en.wikipedia.org/wiki/Light_skin
- https://www.pinterest.com/pin/397513104614955101/
- https://onlinelibrary.wiley.com/doi/pdf/10.1034/j.1600-0749.2002.1o071.x