Answer:
The two groups were at war because they represented two powers with different ideologies, which placed them as rivals in the quest for international influence.
Step-by-step explanation:
The Cold War was an ideological and political confrontation established between the US and the USSR. These two countries were two economic and military powers, being very influential throughout the world, which allowed both to determine international and political relations. Despite all this power, the US and the USSR had different ideologies regarding their economic policies. The US as a capitalist country saw the USSR as a rival because of its communist policy. The USSR saw the US in the same way and for this reason, both countries tried to increase their influences by competing politically, technologically and economically, evaluating which ideology was more capable of impacting the world and gaining allies.