ALCATRAZ ISLAND, United States (AFP) - A tribal chant rose from a thousands-strong prayer circle on Alcatraz Island in San Francisco Bay as Native Americans held a sunrise "Unthanksgiving Day" ceremony. "What we call it is Unthanksgiving," Bear Lincoln of the Wailikie Tribe told AFP as he waved burning sage to purify the area and ward off evil spirits. "It was the saddest day for us. It was a big mistake for us to help the Pilgrims survive that first winter. They betrayed us once they got their strength." Traditional Thanksgiving feasting in the United States is a tribute to...