In The Name of Allah, The Most Merciful, The Bestower of Mercy.
Allah [The Most High] said:
يَـٰٓأَيُّہَا ٱلنَّاسُ إِنَّا خَلَقۡنَـٰكُم مِّن ذَكَرٍ۬ وَأُنثَىٰ وَجَعَلۡنَـٰكُمۡ شُعُوبً۬ا وَقَبَآٮِٕلَ لِتَعَارَفُوٓاْۚ إِنَّ أَڪۡرَمَكُمۡ عِندَ ٱللَّهِ أَتۡقَٮٰكُمۡۚ إِنَّ ٱللَّهَ عَلِيمٌ خَبِيرٌ۬
O mankind! We have created you from a male and a female, and made you into nations and tribes, that you may know one another. Verily, the most honourable of you with Allah is that (believer) who has the most Taqwah. Verily, Allah is All-Knowing, All-Aware. [Surah Al-Hujuraat. Verse 13]
[لِتَعَارَفُوا – that you may know one another]: Meaning: So that you may know one another and how close you all are to one another in lineage, but not out of boastfulness. Then Allaah informed us that the most elevated amongst them are those who fear Him the most.
The ascription to a tribe and a nation is affirmed in Islam. The companions of the Prophet used to ascribe themselves to their tribes and their people in the presence of the Messenger, and he never disapproved of it, however, there should be no behavior that is tantamount to that of the pre-Islamic era, as the Messenger said, “Indeed, Allah [The Most High] has removed from you the pride of the pre-Islamic period and its boasting about ancestors. One is only a pious believer or a wretched sinner. You are sons of Adam and Adam (was created from) dust. Let the people abandon boasting about their ancestors, for they are merely fuel in Jahannam; or they will become more insignificant in (the sight of) Allah than the beetle which rolls dung with its nose”. 
The Messenger said, “Whoever is held back by his deeds, his (nobility) of lineage will not push him forward”. Imam Nawawi [may Allah have mercy upon him] said, “Meaning, the one whose deeds are deficient and he does not catch up with the performers of (good) deeds, then it is obligatory upon him not to crown himself with the nobility of lineage and the virtues of his forefathers, whilst he is lagging behind in (performing righteous) deeds”. 
The arrival of Islam In Uganda and Gambia
Uganda: Islam reached the Lake Plateau, in Uganda, in several ways: On the east side, via the Islamic East African coasts, and from the north, South Sudan. Islam became well established in the heart of the African continent through the good example demonstrated by its adherents and intermarriage with the indigenous population. 
Gambia: The history of Gambia is an integral part of the history of Senegal. Islam reached it in the fifth century AH and the eleventh century AD, as it was part of the Kingdom of Ghana, and then the Kingdom of Mali. After the colonial competition over West Africa between the Portuguese, the French, and the British, it fell under British colonization. 
To be continued InShaaAllah
 Reported by Imaam Abu Dawud (rahimahullaah)’ Hadith Number 5116. Declared ‘Hasan’ by Shaikh Albaani (rahimahullaah) in his checking of Sunan Abu Dawud. Pages -766-767.Publisher: Maktabah Al-Ma’aarif’ 1st edition
 Sharh Saheeh Muslim: Hadeeth Number 2699; Vol 17. page 18
 Atlas Duwal Al-Aalam Al-Islaamiy. page27
 Atlas Duwal Al-Aalam Al-Islaamiy. page 83