During times of civic unrest such as riots, the national government can summon the national guard to its help if it thinks that the local forces cannot stop it or if the riots are going out of hand.
Constantinople was the capitol city of Byzantine Empire .
Answer: Constantinople.
It is the answer d because yeah
1. The fact that all Incan architecture shares similar design principles suggests C. unity. - they all wanted to be the same because they were a union
2. The towers of St. Basil's Cathedral in Russia are symbolic of C. eight battles.
3. The Greek arch can typically be seen in all of these, but let's say A. bridges.
