When President Trump came to power in 2016 he vowed he would scrap the international trade agreements he believed had cost a huge number of US jobs, and declared his intent to tip the trade balance back in America's favour. He wanted to take on China and what he saw as its dominance in the global marketplace.

How has this 'America First' policy worked out in the ensuing four years, and what has it meant for the US's trading partners?

As part of our look at the US elections 2020: and What the World Wants, Manuela Saragosa examines whether President Trump has succeeded in his aim, and she finds out what companies from China to Canada hope will come out of the next presidency. Manuela talks to Herbert Lun, managing director of Wing Sang electrical, whose factory is in China's Pearl River Delta. He produces electronic hair products for the American market - how has his business coped with the threat of US tariffs? While Mark Rowlinson, counsel at the United Steelworkers of Canada, tells Manuela that tariffs have brought some Canadian steel and aluminium producers - operating in an already very tight market - to the edge of bankruptcy.

The BBC's economics correspondent, Andrew Walker, is on hand to provide context and analysis throughout, and you can read more on the BBC website and hear more about the USA and the rest of the world, across the World Service this week.

Manuela and her guests also consider the alternative to President Trump - a Joe Biden presidency - and whether that would make it any easier to do business with the US. There might be a change of tone, but would he actually dismantle the protectionist policies of the last four years?

Picture: Trump Tower in New York. Credit: Getty