Nationalism led to the assassination of the Archduke of Austria Franz Ferdinand. he was assassinated by Gavrilo Princip, a Serbian Nationalist.
The Answer: Machu Picchu
Reason:
Out of all of the ruins provided, Only the ruins of Machu Picchu was constructed by the Inca Empire.
The ruins of the Olmec's were created by the Olmec's
The ruins of Chichen Itza were created by the Maya people
And the ruins of Tenochtitlan were created by the Aztec people
The two major scandals that plagued the Harding administration were 1) the attempted theft of national oil reserves, and 2) his infamous "Ohio Gang" was accused of trying to sell lands that were taken from the Germans.