Answer:
C. American colonies to unite in their effort.
Explanation:
I'm taking this in 9th grade, good luck. You're welcome.

⚘The Roman Republic (Latin: Rēs pūblica Rōmāna [ˈreːs ˈpuːblɪka roːˈmaːna]) was the era of classical Roman civilization, led by the Roman people, beginning with the overthrow of the Roman Kingdom, traditionally dated to 509 BC, and ending in 27 BC with the establishment of the Roman Empire. During this period, Rome's control expanded from the city's immediate surroundings to hegemony over the entire Mediterranean world

The battle of Chancellorsville, because it was a huge victory for the confederacy and general Robert E. Lee during the civil war
The answer would be Shang dynasty. Hope this helps you out