What was one strength the united states had going into the war

1 Julius Caesar named Octavian as his heir.

2 Octavian successfully invaded Egypt, causing his rival Mark Antony to kill himself.

Explanation:

Octavian was the first emperor of the Roman Empire, and was the one that made the convertion frim a Republic to an empire, he was named heir of Julius Caesar by the Caesa himself and when he died he formed a triumvirate with Mark Antony and Marcus Aemilius, eventually he would have problems with Mark Antony that would lead to civil revolts and the invasion of Egypt, this would end with Mark Antony and Cleopatra killing themselves.