gained
lost
Neither lose nor gain.
japan lost territories
The Ottoman Empire lose Moldova and Romania in 1877.
By pushing the British out of the U.S. they got the territory that the Quebec Act made them lose You may want to check this answer on google.com
SUp
After World War 1 German lost all its overseas territory and about 15% of its territory in Europe.
Lose
That's TobyMac's 'Lose My Soul'.
you have nothing to lose or to gain
It didn't gain any land. It did lose a lot of land, though.
If you mean because of the attack on Pearl Harbor, then no. But Korea broke away from Japan during WWII.