This is a bad poll. We didn’t win anything on July 4, 1776. We were losing the war, and the Founding Fathers put a noose around their necks on July 4, 1776. A lot more than 26% of the people don’t realize the act of bravery that signing that document meant. The simpleton’s explanation that we “won” our independence on this day is an insult to what they really did.
The poll doesn’t appear to suggest that we “won” anything on July 4, 1776, just “declared.” It does, however, ask from which country we won independence, which was an historical eventuality looking forward from that date.