A reason that the United States and its allies formed NATO was to

invade the Soviet Union.
establish a single government in Europe.
defend member nations against Communist attacks.
promote free trade among its members.

Respuesta :

Answer : Defend member nations against communist attacks.

Nato was formed after WWII, and the aftermath of the soviet union. The united states and other nations were mostly concerned about the soviet union and their communist attacks, so they decided to form NATO to prevent this and promote peace among nations.

Answer:

C )  defend member nations against Communist attacks.

Explanation:

It is the correct answer trust me.