Please explain the stones for corners or foundations?
In ancient times, stones were used to build most of the larger public buildings and temples. It was a lasting material for building large structures, even for centuries in some cases. In USA’s case, many building materials were sold to foreign countries of the world. These materials included lumber, brick and the other items used to construct building and homes. Because Babylon will be nuked in the second half of the Tribulation, the intense radiation in that country will preclude any building supplies to be bought by any other country. Babylon’s export quota will be zero.