If Allah had willed, He would have made all of Humanity one Nation

Allah says:

وَلَوْ شَآءَ اللَّهُ لَجَعَلَكُمْ

Accepting Bribe is Sternly Forbidden as It Breaks the Covenant of Allah

Verse 95 which begins with the words: وَلَا تَشْتَرُ‌وا بِعَهْدِ اللَّـهِ ثَمَنًا قَلِيلًا (And do not take a paltry price against the pledge of Allah) that is, 'do not break the Covenant of Allah for a paltry price.' Here, 'a paltry price' refers to worldly life and its gains. No matter how major they may be yet, as compared with the gains of the Hereafter, even the entire world and its en-tire wealth is nothing but paltry. Whoever opts for the gains of the mortal world at the cost of the far superior returns in the Hereafter has struck a deal which will bring nothing but utter loss - because, selling off a blessing which is supreme and a wealth which is everlasting in exchange for something fast perishing and intrinsically low is what no sensible person would ever elect to do.