If the Prophet (Salallahu Alayhi Wasallam) had been sent to any country other than Arabia, the message of the last Prophet (Salallahu Alayhi Wasallam) would have encountered complications due to the past and the previous history of victories and defeats and possessions of or possessions by the chosen country. There was also the risk of his message losing power and grace and a part thereof might have attributed to ancient traditions of the chosen country. The magnificent task of redressing civilization, character, and spiritual values could not have been accomplished and all his endeavors would be lost in the ancient customs and traditions of the country concerned.
Since the Arabian character, civilization, and society were far from progress and development, it was obvious that it was this universal that made them highly civilized, morally disciplined, and a graceful nation, and the teachers and leaders of the world. The spiritual power of the Prophet (Salallahu Alayhi Wasallam) was tremendous that ever nation in every period during his time and after him benefited from him. Moreover, the Qur’aan is the culmination of all the teachings imparted by all the Prophets and guides.
That does make a lot of sense. Given the fact that some try to weakly attribute that the Quran is just a book that ripped off from the Bible and Torah, imagine how much more fun they would have had attributing everything to the ancient culture! After all Islam changed a people from idol worship by the Ka’bah to maintaining utmost humility and praying to the one true God by the Ka’bah, from killing their daughters to treasuring their daughters, and from a basically very dark age to ruling over half the Earth!