Answer: CLAIM
Explanation:
I think it's claim because the definition is "state or assert that something is the case, typically without providing evidence or proof.
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Persistence to continue fighting
During the Second World War, the Soviet Union and the United states of America are great allies. After the great World War the two powers became competitors creating bipolar world. The two then are engaged in the so called Cold War. Europe was then divided into two blocs - The Western Bloc which is led by US and the Easter Bloc which is led by the Soviet.
