California has 3 in the global top 5 (with 7 in top 50) ! As the US has a total of 22 universities in the engineering top 50, then California is responsible for about 1/3rd of the USA’s dominance in the field. At least according to the statistics compiled by The Times Higher Education and Thomson Reuters, “World University Rankings 2011-2012″, which I would expect to be globally balanced.