WASHINGTON — With fireworks heralding his big moment, Donald Trump swept into Washington Thursday on the eve of his presidential inauguration and pledged to unify a nation sorely divided and clamoring for change. The capital braced for an onslaught of crowds and demonstrators — with all the attendant hoopla and hand-wringing. "It's a movement like we've never seen anywhere in the world," the president-elect declared at a celebratory evening concert Thursday night with the majestic Lincoln Memorial for a backdrop.