WASHINGTON — In a global exclamation of defiance and solidarity, more than 1 million people rallied at women’s marches in the nation’s capital and cities around the world Saturday to send President Donald Trump an emphatic message on his first full day in office that they won’t let his agenda go unchallenged.“Welcome to your first day, we will not go away!” marchers in Washington chanted.Many of the women came wearing pink, pointy-eared “pussyhats” to mock the new president. Plenty of men joined in, too, contributing to surprising numbers everywhere from New York, Philadelphia, Chicago and Los Angeles to Mexico City, Paris, Berlin, London, Prague and Sydney.The Washington rally alone attracted more than 500,000 people, according to city officials — apparently more than Trump’s inauguration drew on Friday. It was easily one of the biggest demonstrations in the city’s history, and as night fell, not a single arrest was reported.The international outpouring served to underscore the degree to which Trump has unsettled people in both hemispheres.“We march today for the moral core of this nation, against which our new president is waging a war,” actress America Ferrera told the Washington crowd. “Our dignity, our character, our rights have all been under attack, and a platform of hate and division assumed power yesterday. But the president is not America. … We are America, and we are here to stay.”Turnout in the capital was so heavy that the designated march route alongside the National Mall was impassable. Protesters were told to make their way to the Ellipse near the White House by way of other streets, triggering a chaotic scene that snarled downtown Washington. Long after the program had ended, groups of demonstrators were still marching and chanting in different parts of the city.