Changes to what is regarded as entertainment can occur in response to cultural or historical shifts.

A larger historical shift explains the work's sudden authority.

"We're dealing with a profound historical shift in the economy that has been enabled by technology."

"There is an historical shift in having all these questions," she said.

Is this a historical shift in the nation's political allegiance, or just a passing swing of the pendulum, as Democrats have taken to arguing?

It wasn't as simple as historical shifts in water distribution due to weather or other environmental factors.

The reason for the differentiation is that there has been a historical shift in the meaning of what belonging to a nation means.

Indeed, they are so helpful in clarifying that historical shift that the history of those years may now have to be rewritten.

A Catholic majority on the nine-member court would be a significant historical shift.

Yet this great historical shift has been almost trivialized in its translation into public debate about the budget.