Why are there so Many Native American Ruins in the United States?

For God Destroyed them for their Insolent Way of Living, and those are their Dwellings which have Not been Inhabited After Except Briefly

So Travel Throughout the Land and Observe How the End was for the Deniers

28:58, Qur'an
[So] how many cities have We destroyed that were insolent in its [way of] living? And those are their dwellings which have not been inhabited after them except briefly. And it is We who were the inheritors.

6:11, Qur'an
[So] say, "Travel through the land; then observe how the end was for the deniers."

So have you Not Traveled throughout the Earth and Seen How the End was for those Before you?