To date the largest species of Eagle would be the Philippine Eagle (Monkey Eating Eagle) from the Philippines and neighboring isles. The second largest would be the Harpy Eagle.
Yes, in fact, it is the bird of the United States, and is protected by federal law, so if you poach one in the United States, then you are in big trouble.
A bald Eagle? No The Golden Eagle is a separate species of Eagle than the Bald Eagle. Perhaps you are confused by the maturing age of a Bald Eagle when it grows from a chick to an adult. It looks...