With this year's success, young Indian-Americans have won as many as 14 of the past 18 contests and the eighth year in a row. This is also the first time a sibling of a former champion won. The third spot was also bagged by an Indian- American Cole Shafer-Ray from Oklahoma.

"This is a dream come true. I have wanted this for such a long time," Shivashankar, the sister of 2009 champion Kavya Shivashankar, said while dedicating the award to her grandmother who passed away in October.

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Appearing for the fifth and the final time for the contest, the eighth-grader from Kansas confidently spelled words as cytopoiesis, bouquetiere and thamakau before she was asked to tackle the golden word.

Basketball enthusiast Venkatachalam spelled words like poblacion, caudillismo and nixtamal before official bee pronouncer Jacques Bailly broke the news to him that Shivashankar had correctly spelled scherenschnitte, the German-derived word for artistic paper cutting.

Asked later what was on his mind when he heard the word nunatak, his winning word, he said: "Me and Vanya are going to be champions." Yesterday, racist trolling was casting an ugly pall over social media as the reaction from some of the nearly one million people viewing the finals live posted biased views about the domination of non-Americans on the contest.

"One year I wish an American kid could win," read a Twitter post. "The kids in the spelling bee should only be AMERICAN," a third tweet said. Earlier, slamming the racist backlash against the winners of Indian-origin, the bee's longtime director Paige Kimble said their domination of the contest could be put down to their "perseverance".

Indian-Americans account for just under 1 per cent of the US population, but make up more than a fifth of the 285 spellers competing this week in the 88th edition of the bee, beginning today. If recent trends hold, they would account for more than a third of the contest's 50 semifinalists.