The phrase "a battleground over" is correct and usable in written English.
It can be used to describe a contentious issue or topic where opposing views or conflicts are present.
Example: "The debate on climate change has become a battleground over scientific evidence and policy decisions."
Alternatives: "a point of contention regarding" or "a site of conflict over".
It has also become a battleground over future energy sources in the region.
Islington in north London became a battleground over gentrification in the 1970s.
As the nation hurtled toward a war over slavery, Californians watched as their own state became a battleground over the future of human bondage.
But the debates over money were inextricably tied to accusations of racism in a district that has long been a battleground over school desegregation.
Whether or not state lawmakers take up the constitutional amendment in the coming weeks, the ruling ensures the state will become a battleground over same-sex marriage.
"There are more important things we have to worry about right now," said Mayor Shirley Franklin of Atlanta, than "turning the state into a battleground over the Confederacy".
Q. College students can have the choice to vote in their college town instead of their hometown, with the possibility of choosing a battleground state over a safe state.
We all agreed: it'd be real easy to draw up a list of 12 excellent video games from the British Isles released over the past dozen months that would comprise a shortlist worth turning Twitter into a battleground (again) over.
We all agreed: it'd be piss easy to draw up a list of 12 excellent video games from the British Isles released over the past dozen months that would comprise a shortlist worth turning Twitter into a battleground (again) over.
Even though my skin is still a battleground from over 10 years of cystic acne, I can deal with it without feeling suicidal; despite the scars that encircle my belly button from years of ingrown hairs, I can take my shirt off now without it feeling as though they're a glowing neon sign.
This month it has turned into an unseemly battleground over a bid by Australia's government and various environmental groups to stop Japan hunting and slaughtering whales.
