US secretary of state John Kerry: said the negotiations “could go either way”. Photograph: Reuters/Leonhard Foeger

The conclusion of a nuclear agreement with Iran, should it happen, will mark only the start of negotiations at home for the White House as it has b(...)

US president Barack Obama:  crisis has little direct risk to the US. Photograph: Jonathan Ernst/Reuters

The Obama administration refused to be drawn on whether Greece should be given a debt write-off as a way of resolving the debt crisis. “The creditors(...)

Fitbit’s Flex is  an “electronic coach”. The firm offers bracelets and clip-on devices which monitor your physical activity, especially steps taken, pace and heart rate. Photograph: Josep Lago/AFP/Getty

The Tudor Queen, Elizabeth 1st, was reputedly among the first in the world to wear a clock on her body, an “armlet” received as a new year gift in 157(...)

The private dealings involving Hillary Clinton and her  advisers were revealed through emails released in response to  her use of a personal email account to conduct US government business. Photograph: Reuters

Hillary Clinton ruled herself out of a panel discussion on Northern Ireland in 2009 involving Irish and British politicians at a meeting of her family(...)

A man watches a television broadcast of US president Barack Obama speaking, in Havana on Wednesday. Mr Obama said the US would increase contacts with the Cuban people and engage with the Havana government, civil society and ordinary Cubans. Photograph: Enrique de la Osa/Reuters

The United States and Cuba have agreed to reopen embassies in each other’s capitals, officially restoring diplomatic relations more than a half centur(...)

US president Barack Obama. Photograph: Brendan Smialowski/AFP/Getty Images

The US and Cuba have agreed to open embassies in each other’s capitals, as the countries bid to restore ties after more than 50 years of hostilities. (...)

IMF managing director Christine Lagarde speaks to Spanish Economy Minister Luis de Guindos prior to the beginning of a Eurozone finance ministers meeting in Brussels. Photograph: Reuters/Philippe Wojazer

Greece will fall into arrears with the International Monetary Fund and cannot receive any further loans when the Athens government fails to make a €1.(...)

 Pooja Mandagere (left) and Natalie Thompson celebrate  outside the US Supreme Court following the announcement of the ruling  that the constitution guarantees a nationwide right to same-sex marriage.  Photograph: Doug Mills/the New York Times

US president Barack Obama hailed a Supreme Court ruling legalising same-sex marriage across the country as a “victory for America.” The ruling mean(...)

President Barack Obama: ‘This law is now helping tens of millions of Americans.’ Photograph: AP Photo/Pablo Martinez Monsivais

For years, US president Barack Obama has faced the sneers of political adversaries who called his health care law Obamacare and assailed his effort to(...)

Russian president Vladimir Putin. Photograph: Sergei Karpukhin/AFP/Getty Images

US President Barack Obama spoke with President Vladimir Putin of Russia on Thursday in their first direct contact in four months as the United States (...)