The united states was part of the allies
The event that marked the end of the Roman Republic is often attributed to the defeat of Marc Antony in 31 BC at the Battle of Actium which ended the period of civil war.
I know a lot of history of Dr.King himself. When he said let 'Let freedom ring" he's using Anaphora.
Senators
Julius Caesar is generally regarded as being the most responsible for Rome's move from a republic to a dictatorship. Although he played a major role in transforming the Roman Republic into the Roman Empire he was eventually assassinated by a group of senators