Final answer:
Alexander Hamilton and Eliza communicated through letters.
Step-by-step explanation:
Names in question
The question mentions Hamilton and Eliza, so we can assume they are referring to Alexander Hamilton and his wife Eliza Hamilton.
Communication
They would likely have used letters to communicate with each other. They could have either hand-delivered the letters or sent them through the postal service.
Examples
For example, Alexander Hamilton often wrote letters to Eliza when he was away on business or during their courtship. These letters expressed his thoughts and feelings, and helped them stay connected.