"become historic" is a correct and usable phrase in written English
You can use it when you want to suggest that something has become a part of history. For example: "This moment will become historic when she steps out onto the stage to accept her Nobel Prize."
A decision protecting same-sex marriage would probably also soon become historic.
Now they are triumphant, and their old pains and desperate attachments have become historic and quirky.
In the space of time, polarizing presidents have become historic statesmen.
This incident did NOT become historic when for the first time the USSR paid the damages.
Now Red Sox fans are triumphant, and their old pains and desperate attachments have become historic and quirky.
Portraits from Supreme Court cases, where cameras are prohibited, become historic artifacts that are passed down from generation to generation.
The pageant became historic over the years as his nasty stuff lashed downward toward batters' ankles.
It's true what you say about Top of the Pops – the lip-synching itself became historic.
"By escaping slavery and helping many others do the same," the writer Feminista Jones argued in the Washington Post, "Tubman became historic for essentially stealing 'property'property
Though the situation was practically hopeless, he masterfully reorganized both the front and the transport systems, made prudent use of the artillery, and was able to inspire in his troops a heroism that became historic.
In view of the rapid developer destruction of large parts of the city not even eligible for historic district status, when, finally, "modern" becomes "historic" in New York, the Landmarks Commission will have little left to list.
