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True, but when you use the optics "it is no man's land, let's take it while we can", why only in the case of 1919-1921, but not in the 1939 case?

When Soviets crossed Polish borders in 1939, the Polish statehood was exactly in the same defunct state as the Soviet in 1919-21.

Soviet Union decided to attack, it lost the war, it had to ceede territory.

Poles didn't cross the Soviet border in 1919.