Mr. Obama's approach to engagement to some degree makes him dependent on people who wish neither him nor America well. This doesn't have to end badly and I hope that it doesn't - but it's not an ideal position after one's first year in power.

When Edward Gibbon was writing about the fall of the Roman Empire in the late 18th century, he could argue that transportation hadn't changed since ancient times. An imperial messenger on the Roman roads could get from Rome to London even faster in A.D. 100 than in 1750. But by 1850, and even more obviously today, all of that has changed.

Carter's hopes died when the Soviet Union invaded Afghanistan and he ended up having to reverse policy and launch the military buildup that Reagan continued. Mr. Obama would be forced back into a war on terror if terrorist groups pull off enough damaging or frightening attacks to force this issue to the fore.

The historian assesses that the investment of the wealthy classes in the Bank of England wedded them to the fate of the nation as a whole and to the maintenance of its stability.

Mr. Obama's approach to engagement to some degree makes him dependent on people who wish neither him nor America well. This doesn't have to end badly and I hope that it doesn't - but it's not an ideal position after one's first year in power.

Jordan is the only Arab state that has provided citizenship to Palestinian refugees and integrated them. But something has to be done about the Palestinians living in refugee camps in Syria and Lebanon.

This very individualistic form of Protestant Christianity that became so basic in English and then American life is to a large degree responsible for the historical success of Britain and America.