Final answer:
The question pertains to an event or achievement related to Benjamin Franklin around 1727 or 1728. However, specific accomplishments during this exact period are not detailed in the provided information.
Step-by-step explanation:
The student's question concerns a specific event or achievement associated with Benjamin Franklin that occurred around 1727 or 1728, which resulted in a subsequent development in either 1728 or 1729. While the question does not clearly specify what this event of achievement was, several aspects of Franklin's life can be noted during that period. Benjamin Franklin, whose accomplishments spanned various fields such as diplomacy, science, and politics, made numerous contributions to the United States.
He established the Library Company of Philadelphia in 1731, created the American Philosophical Society in 1743, provided the foundation for the University of Pennsylvania in 1749, and was instrumental in developing Pennsylvania Hospital in 1751. Additionally, his call to 'Join or Die' became a rallying cry for colonial unity. Franklin's role as a diplomat was also remarkable; he served as the U.S. Ambassador to France and played a key role in negotiating the Treaty of Paris in 1783, which recognized U.S. independence.