Cresap's War (also known as the Conojocular War, from the Conejohela Valley where it was mainly located along the south bank) was a border conflict between Pennsylvania and Maryland, fought in the 1730s. Hostilities erupted in 1730 with a series of violent incidents prompted by disputes over property rights and law enforcement, and escalated through the first half of the decade, culminating in the deployment of military forces by Maryland in 1736 and by Pennsylvania in 1737. The armed phase of the conflict ended in May 1738 with the intervention of King George II, who compelled the negotiation of a cease-fire. A final settlement was not achieved until 1767 when the Mason–Dixon line was recognized as the permanent boundary between the two colonies.
By denying Eric his choice to vote for his preferred candidate, his right to vote freely and without duress was violated. Liberty is enshrined in the United States Constitution and this denial has violated the principle of liberty but taking away his freedom to choose who he votes for.
I would focus on how one of the empires lasted for nearly 2 millennia (if you count Byzantium as Rome), and how the other fell apart very soon after the empire’s namesake “Alexander” perished.