How has diplomacy evolved through history? In your response, consider the early purpose and practice of diplomacy, and how it has evolved over time.

How has diplomacy evolved through history?
In your response, consider the early purpose and practice of diplomacy, and how it has evolved over time.
During which period of time was diplomacy most effective? When was it least effective? How does historical diplomacy compare to modern diplomacy?
Discussion posts should be substantive, meaning at least 250 words.