Thousands of people across the country marched, shut down highways, burned effigies and shouted angry slogans on Wednesday night to protest the election of Donald J. Trump as president.
The demonstrations, fueled by social media, continued into the early hours of Thursday. The crowds swelled as the night went on but remained mostly peaceful.
Protests were reported in cities as diverse as Dallas and Oakland and included marches in Boston; Chicago; Portland, Ore.; Seattle and Washington and at college campuses in California, Massachusetts and Pennsylvania.
In Oakland alone, the Police Department said, the crowd grew from about 3,000 people at 7 p.m. to 6,000 an hour later. The situation grew tense late Wednesday, with SFGate.com reporting that a group of protesters had started small fires in the street and broken windows. Police officers in riot gear were called in, and at least one officer was injured, according to other local news reports.
It was the second night of protests there, following unruly demonstrations that led to property damage and left at least one person injured shortly after Mr. Trump’s election was announced.
The protests on Wednesday came just hours after Hillary Clinton, in her concession speech, asked supporters to give Mr. Trump a “chance to lead.”
One of the biggest demonstrations was in Los Angeles, where protesters burned a Trump effigy at City Hall and shut down a section of Highway 101. Law enforcement officials were called out to disperse the hundreds of people who swarmed across the multilane freeway.
In New York, crowds converged at Trump Tower, on Fifth Avenue at 56th Street in Midtown Manhattan, where the president-elect lives.
They chanted “Not our president” and “New York hates Trump” and carried signs that said, among other things, “Dump Trump.” Restaurant workers in their uniforms briefly left their posts to cheer on the demonstrators.
The demonstrations forced streets to be closed, snarled traffic and drew a large police presence. They started in separate waves from Union Square and Columbus Circle and snaked their way through Midtown.