Answer:
I think Terrorism has been a challenge for the US because there have been some serious attacks that left many people dead.
John F. Kennedy ran against c. Richard M. Nixon in the 1960 presidential election
The fall of Constantinople meant the collapse of the Eastern Roman Empire. The Greek Orthodox Church was the dominant religious expression in the empire. The Ottoman Turks conquered the Empire. Muslims allowed Christians to continue and Christianity flourished. Jews also found refuge from persecution with the Ottoman Empire.
