Conversation so far:
where did the uwunited states gain independence from
The US obtained independence from Great Britain.
when did the US gain independence?
The US gained independence July 4, 1776.
how many people signed the united states declaration of independence?
56 people signed the United States Declaration of Independence
where was the united states declaration of independence signed?
The United States Declaration of Independence was signed at Independence Hall.

Question: who was the president of congress during the event?
Self-contained rewrite: who was the president of congress during the time of the signing of united states declaration of independence?