The US now accounts for 15 of the world's 20 largest hyperscale datacenter markets, with Northern Virginia alone hosting nearly 12 percent of global capacity. US locations have increased their dominance of the rankings as cloud infrastructure expands, according to Synergy Research. Since last year, Tokyo, Sydney, and South Carolina have dropped out of the top 20, replaced by Indiana, Tennessee, and China's Guangdong province. Of the remaining fi…