RIYADH, Saudi Arabia — With the tacit backing of his father, Saudi Arabia’s 32-year-old crown prince has established himself as the most powerful figure in the Arab world, rushing into confrontations on all sides at once. Crown Prince Mohammed bin Salman ordered the arrest of 11 princes in his royal family and nearly 200 members of the Saudi business elite, and has begun to take power from the kingdom’s conservative clerics . He has blockaded neighboring Qatar, accused Iran of acts of war and encouraged the resignation of Lebanon’s prime minister. And in Yemen, his armed forces are fighting an Iranian-aligned faction in an intractable war that created a humanitarian crisis . The crown prince has moved so quickly that American officials and others worry that he is destabilizing the region. Signs of potential blowback are growing. Investors, nervous about his plans, have been moving money out of the […]