How has America's relationship with cannabis changed?

As more states legalise marijuana, we explore how the US' relationship with the drug has changed. The Americast team chats to a drug historian and a former adviser to Clinton, Bush Jnr and Obama on drug policy.

We also look at how the unions are shaping American life.

Americast is presented by North America editor Sarah Smith, Today host Justin Webb, the BBC's Social Media and Disinformation Correspondent Marianna Spring, and North America correspondent Anthony Zurcher.

Find out more about our "undercover voters" here: https://www.bbc.co.uk/news/world-us-canada-63530374 Email Americast@bbc.co.uk with your questions and comments and send us a message or voice note via WhatsApp, to 03301239480.

This episode was made by Phil Marzouk, Alix Pickles, Cordelia Hemming and Paige Neal-Holder. The studio director was Emma Crowe. The assistant editor was Sam Bonham. The senior news editor was Jonathan Aspinwall.