Around this time the United States also became interested in asserting their power in the region, and they threatened intervention following a number of incidents involving their consul in the Fiji islands, John Brown Williams. In 1849, Williams had his trading store looted following an accidental fire, caused by stray cannon fire during a Fourth of July celebration, and in 1853 the European settlement of Levuka was burnt to the ground. Williams blamed Cakobau for both these incidents, and the U.S. representative wanted Cakobau's capital at Bau destroyed in retaliation. A naval blockade was instead set up around the island which put further pressure on Cakobau to give up on his warfare against the foreigners and their Christian allies. Finally, on 30 April 1854, Cakobau offered his ''soro'' (supplication) and yielded to these forces. He underwent the ''lotu'' and converted to Christianity. The traditional Fijian temples in Bau were destroyed, and the sacred ''nokonoko'' trees were cut down. Cakobau and his remaining men were then compelled to join with the Tongans, backed by the Americans and British, to subjugate the remaining chiefs in the region who still refused to convert. These chiefs were soon defeated with Qaraniqio of the Rewa being poisoned and Ratu Mara of Kaba being hanged in 1855. After these wars, most regions of Fiji, except for the interior highland areas, had been forced into giving up much of their traditional systems and were now vassals of Western interest. Cakobau was retained as a largely symbolic representative of a few Fijian peoples and was allowed to take the ironic and self proclaimed title of "Tui Viti" ("King of Fiji"), but the overarching control now lay with foreign powers.