Both messages appear to mark a significant change in American policy.

However, there are also other reasons to write about a year even if it does not mark a major change in the flow of history.

The turn of the millennium marked a huge change in the park.

The period marked a significant change in the cultural history of the area.

You didn't have more than four or five of them in your life, and every one marked a real change.

If that offer is serious, it will mark a radical change in policy.

"It could actually mark a change for them if it's successful."

This marks a major change from the way it used to be.

There was a pause, just long enough to mark a change of tone.

However, last year's statistics may mark a change in the trend here.