'expansion to' is correct and usable in written English.
It suggests a transition to something larger in scope. For example: "The company's success has enabled an expansion to overseas markets."
(And there's that expansion to Canada and Kuwait).
It would enable the expansion to continue.
"Many countries have room for fiscal expansion to strengthen demand.
Retailers have shifted focus from expansion to rationalisation.
They expect the O'Hare expansion to pay off.
Our focus now is on continuing its expansion to all claimants".
Zardari responded that he supported increased privatization and economic expansion to build the middle class.
Duke and North Carolina have opposed the expansion to 12 or 13 colleges.
An easier expansion to achieve is, perhaps, the gallery's relationship with living artists.
The prospect has exercised the Russians even more than NATO's proposed expansion to Russia's border.
Both ports require dredging and expansion to manage the increased volume of shipping.
