A second night of protests in the United States against President-elect Donald Trump has turned violent in Portland, Oregon, as thousand of demonstrators took to the streets in the city, smashing car windows destroying shops.

The protesters also threw firecrackers and set a large rubbish bin alight, a development the police has declared as a riot.

The demonstrators were made up of mainly young people saying a Trump presidency would create deep divisions along racial and gender lines.

There were no reports of violence at the other protests, although demonstrators in Minneapolis briefly blocked an interstate highway.

In Philadelphia crowds gathered near City Hall holding placards bearing slogans such as “Not Our President”, “Trans Against Trump” and “Make America Safe For All”.

In Baltimore, police said a peaceful crowd of 600 people marched through the city, blocking traffic while in San Francisco, high school students waved rainbow banners and Mexican flags.

A small crowd also gathered outside Trump Tower in Chicago, a day after thousands marched through the city centre.

Protesters also returned to Trump Tower in New York for a second night.

Meanwhile Mexico’s president Enrique Pena-Nieto said he was optimistic his country could have a positive relationship with the US under Trump, despite his anti-Mexican rhetoric during the campaign.

He said that he and Trump had agreed to meet, possibly during the transition period before Trump’s inauguration in January.

Similarly, in Russia, spokesman to President Vladmir Putin said that Trump and the Russian leader were “very much alike” in how they see the world..

Earlier, Trump said it was a “great honour” to meet President Obama for transition talks at the White House, while also criticizing the protests which he said was incited by the media.

Obama on his part said his priority was to “facilitate a transition that ensures our president-elect is successful”.

The president-elect was accompanied by his wife, Melania, who also had a meeting with First Lady Michelle Obama.

Trump later tweeted that he had had “great chemistry” with Obama, while his wife “liked Mrs O a lot”.

He and Vice-President-elect Mike Pence then met Republican House Speaker Paul Ryan, saying they “can’t get started fast enough, whether it’s healthcare or immigration”.

The Speaker described it as a “fantastic, productive meeting”.

With the Republicans now holding a majority in both chambers of the US Congress, Trump can more easily target key Obama initiatives such as his healthcare reforms.

Trump’s transition team for the 10-week period until inauguration will be led by Chris Christie, Governor of New Jersey.

Mr Trump, who has never held elected office, has said his immediate priorities will be restoring the country’s infrastructure and doubling its economic growth.