Answer: The main story arc concerns Harry's struggle against Lord Voldemort, a dark wizard who intends to become immortal, overthrow the wizard governing body known as the Ministry of Magic and subjugate all wizards and Muggles (non-magical people).So, not only did Harry free Britain from tyrannical rule by Voldemort, the universe claimed that Harry was the key to defeating Voldemort. Thus, he was a Very Important Wizard™, regardless of what skills he had or didn't have.
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