According to this quotation, why is the united states fighting the cold war?
to protect democratic liberties in the united states
to prevent the ussr from harming the united states
to spread democracy and liberty around the world
to win the battles fought in the southern half of the globe

United States was fighting the Cold War to help spread democracy and liberty around the world.

Explanation:

The Cold War took its name because the parties were afraid of fighting each other directly. The main enemy of the United States is Soviet Union. They fought cold war to help the world by spreading democracy and liberty.  

The revaluation system were generally liberal to democratic with independent organizations, but were economically and politically interweaved with a huge network. Rivalry between these countries lasts for decades and it leads to anticommunist suspicions and brought them on the verge to nuclear damage of the two international superpowers.