The descendants of Shem were just as dark as the descendants of Haam and Japeth’s descendants looked very different to Shem and Haam’s descendants
Tabaqaat Ibn Saa’d Chapter 1 Seera Al Nabaweyah
And Allah, glory be to him, made in them ( SHEM ) Prophets and books and BEAUTY, and UDMAH and bayaadh( light brown skinned) complexions and the Children of HAAM descended in the southern surroundings and Dabour and it is said for that is the end of Daroom, and ALLAH made them UDMAH and a few of them bayaadh( light brown skinned) in complexion…..
وجعل الله سبحانه فيهم النبوة والكتاب والجمال والأدمة والبياض، ونزل بنو حام مجرى الجنوب والدّبور، وجعل الله فيهم أدمة وبياضاً قليلاً
”And Japeth Al Safwaan descended in the central areas and in the North and they were very white skinned and and very white skinned with some redness (rosy cheeked)”
ونزل بنو يافث الصفوان مجرى الصبا والشمال”، فكان فيهم الحمرة والشقرة
This makes perfect sense why the MOTHER OF THE ARABS was intensively black skinned in complexion
”The people of the village (in Egypt in which Hajar alayha As Salaam was from) was inhabited by jet black skinned people with kinky hair…
Ibn Luhya’h said that Haajir alayha As Salaam was the MOTHER OF THE ARABS”
…قال ابن هشام : حدثنا عبد الله بن وهب عن عبد الله بن لهيعة ، عن عمر مولى غفرة أن رسول الله صلى الله عليه وآله وسلم ، قال : الله الله في أهل الذمة ، أهل المدرة السوداء السحم الجعاد ،
Now what Abu Ubaid Al Qaasm Ibn Salam, may Allah have mercy upon him said, should make more sense to those still in doubt or in denial
Abu Ubaid Al Qaasim Ibn Salaam says in his book Ghareeb Al Hadeeth, Chapter 4 page 388
And his saying Al Hamraa( The reds which means the whites) – It means the non Arabs and the clients (the red slaves and the red people that embraced Islam ) they were named that because the most predominant colours of the Arabs are Al Sumurah and Al Udmah and the most predominant colours of the non Arab is white and red and this is like the saying of the people : If you wanted to mention mankind then you’d say the reds and the blacks. So the reds are all of those that are overwhelmed with whiteness and the blacks are those who are overwhelmed with Al Udmah (blackness) .
غريب الحديث لابن سلام رحمه الله الجزء ج ٤ ص ٣٨٨
قوله: الحمراء – يعني العجم والموالي، سموا بذلك لأن الغالب على ألوان العرب السمرة والأدمة، والغالب على ألوان العجم البياض والحمرة وهذا كقول الناس: إن أردت أن تذكر بني آدم فقلت: أحمرهم وأسودهم، فأحمرهم كل من غلب عليه البياض، وأسودهم من غلبت عليه الأدمة.