US stocks powered higher on Monday, as demand for technology shares remained strong even while the ouster of Venezuela’s President Nicolas Maduro fanned worries over geopolitical risk. Gold and the dollar rallied. The Nasdaq 100 Index jumped, with chip stocks such as Micron Technology Inc. and Intel Corp. among the gainers. The benchmark S&P 500 Index also rose, as shares of energy companies rallied. Gold climbed above $4,400 an ounce, while a gauge of the dollar headed for its biggest gain since November ...