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UN member states are expected to sign a treaty banning nuclear weapons at a meeting in New York on Wednesday. We discuss the nuclear issue with Mark Fitzpatrick, Director of IISS-Americas. The struggling retailer, Toys R Us, has filed for bankruptcy in the US and Canada. We hear from Steve Dennis of SageBerry Consulting about the challenge to traditional retailers from online sellers. Elsewhere in America, we find out how rodeo has been helping some rural areas survive. Fergus Nicoll is joined on the programme by Mitchell Hartman of public radio programme, Marketplace, from Portland in Oregon and Anjani Trivedi of the Wall Street Journal in Hong Kong.

(Picture: UN Secretary General Antonio Guterres addresses the United Nations General Assembly on 19 September. Credit: Getty Images)