But these polling figures suggest a historic shift is under way.

But what does that say about the historic shift?

This marks a historic shift in the focus on the branches of Government.

This historic shift is part of a broader change in university instruction.

This could signal a historic shift in the gun debate.

It can be an historic and seismic shift in our political landscape.

Travel between the countries is booming at a time of historic shifts in relationships throughout the region.

The latter would be a historic shift Congress is unlikely to allow.

It was something much bigger: a historic shift in American politics.

These events mark a historic shift on this crucial issue.