The U.S. president stated it is time to "cut loose the shackles of the past" after five decades of strained relations between the two countries.
Chuck Hagel has resigned after less than two years in the top post.
Nobel Laureate Eric Maskin offers a spirited examination of the political process in the United States. Politics,Economics,Eric Maskin,United States,Lara Vergnaud
Goal is to galvanise member states to sign up to a comprehensive new global climate agreement.
During their call, the two leaders reportedly discussed the growing instability in Iraq and the crisis in Gaza.
The potential 2016 presidential candidate distanced herself from the president in a candid interview.
James Brady, shot in a 1981 attempt on President Reagan's life, lobbied for gun law that bears his name.
Suit alleges he exceeded his powers when he delayed an insurance deadline in his healthcare law.
Scandal-plagued pol was jailed for drugs before making a surprising return to office.
President Barack Obama said close to announcing major changes to system through executive action.
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