Had God wished, He would have made you one nation, but He misguides whom He wishes, and He guides whom He wishes. You will be asked about what you used to do.
Translation endnotes
[16:93] The middle statement could be understood as "He misleads those who wish so" or "He misleads those He wishes." In fact, both fit the paradox emerging from having freedom and God's knowledge and control. God guides those who seek the truth with honesty through reason, and misleads those who do not demonstrate honesty and pure intention, by depriving them from witnessing His great signs in the scripture and in nature (6:110; 7:146; 21:51; 37:84). See 57:22.