The third caliph, Uthman, solved this political problem by choosing one of these collections to be the standard version for the entire Muslim community. He had the other collections destroyed.

Sahih Al Bukhari 4987, Vol 6 No. 510, Arabic Book 66 Hadith 9
https://sunnah.com/bukhari:4987
Narrated Anas bin Malik: Hudhaifa bin Al−Yaman came to `Uthman  at the time when the people of Sham and the people of Iraq  were Waging war to conquer Arminya and Adharbijan. Hudhaifa  was afraid of their (the people of Sham and Iraq) differences  in the recitation of the Qur'an, so he said to `Uthman, "O  chief of the Believers! Save this nation before they differ  about the Book (Qur'an) as Jews and the Christians did  before." So `Uthman sent a message to Hafsa saying, "Send us  the manuscripts of the Qur'an so that we may compile the  Qur'anic materials in perfect copies and return the  manuscripts to you." Hafsa sent it to `Uthman. `Uthman then  ordered Zaid bin Thabit, `Abdullah bin AzZubair, Sa`id bin  Al−As and `AbdurRahman bin Harith bin Hisham to rewrite the  manuscripts in perfect copies. `Uthman said to the three  Quraishi men, "In case you disagree with Zaid bin Thabit on  any point in the Qur'an, then write it in the dialect of  Quraish, the Qur'an was revealed in their tongue." They did  so, and when they had written many copies, `Uthman returned  the original manuscripts to Hafsa. `Uthman sent to every  Muslim province one copy of what they had copied, and ordered  that all the other Qur'anic materials, whether written in  fragmentary manuscripts or whole copies, be burnt. Sa`id bin  Thabit added, "A Verse from Surat Ahzab was missed by me when  we copied the Qur'an and I used to hear Allah's Apostle  reciting it. So we searched for it and found it with Khuza`ima  bin Thabit Al−Ansari. (That Verse was): 'Among the Believers  are men who have been true in their covenant with Allah.' (33:23)