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"expanding borders" is correct and usable in written English.
You can use it to refer to a situation in which the boundaries of a certain region, nation, or organization increase. For example, "The European Union has been expanding its borders over the past decade."
Exact(7)
The gains in Rhode Island and Maine were attributed, in part, to the expanding borders of the Boston suburbs.
Jewish life was restored where it had been extinguished, and the expanding borders of a post-national Europe offered new opportunities to Jews scattered across borders.
"New York in Store" shows some of the places your MetroCard can take you, once you accept the city's expanding borders.
But Nicholas' overconfidence in Crimea in part led to the Crimean war with Britain and France, whose leaders sought to stop Russia's expanding borders and to slow its influence in the Middle East.
Any fundamentalist pan-Islamic movement, even a Shiite-inspired one, must embrace the fact that the Prophet, and later his Caliphs, sought to build empires with temporary but expanding borders, not nations with fixed borders and identities.
From a blood-soaked continent, it forged a new era of peace, prosperity, open societies, and the triumph of "soft power" within its expanding borders.
Similar(51)
"Ultimately all these settlements — their presence, their expansion, their expanded borders and so on — they're all illegal, and we don't recognize their legitimacy," she said.
15 Albright Warns Albanians Secretary of State Madeleine K. Albright addressed the Albanian Parliament and warned against any ambition to avenge atrocities in Kosovo or to expand borders.
Instead of being the last Great Power to join a fight (and thus coming in fresh and strong), it assumed the opposite role: It would place its forces in the front line, along the newly expanded borders of insecurity — Berlin, the Mediterranean, Korea, Southeast Asia.
Canada, a major Arctic player and key opponent to Russia in the quest for expanded borders in the Far North looked at that military expansionism with concern.
It conveniently ignores that it was from within those "Auschwitz borders" that Israel defeated the combined forced of Egypt, Syria and Jordan in six days in 1967 (at the cost of 776 Israeli lives) while in 1973, from vastly expanded borders, losing 2688 soldiers and almost the war itself following an Egyptian and Syrian attack.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com