because white people have made sure that everything is about race

as proved by the fact that when you say explorer, you think of a bunch of white guys walking the world and discovering it ~exotic wonders~ even though Zheng He travelled through Asia, to the Middle East, and even East Africa. But you’d likely never heard of him before.

Same reason you never heard of Ahmad Ibn Fadlan, an Arab traveller who, as early as the 10th century, went to the Volga area for diplomatic reasons. He wrote about it, much as Marco Polo would do later for his own travels, and is one of our sources on what viking were like (and by all accounts, he wrote about them more accurately than western scholars of the same period did)

Oh, or Ibn Battuta who travelled throughout Africa long before europeans did, and even went to Europe himself.

And that’s just some example of Muslim medieval travel writers

Everything is about race because white people keep telling everyone that their race is the only one who every got anything done.