According to the domino theory, if South Vietnam fell to Communism, then ?

Neighboring countries would soon follow

Explanation:

Domino theory basically says that if one country goes down then the country next to it or near it will too, just like a domino.

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.

i am a strong (insert gender here) my father and his brother were to, they were killed not by the cold, not by the bears or wolves that roam our streets at night, but by the   bolsheviks. we must stand up and fight communism or we all end up dead, starved dehydrated, enslaved. the time is now we must fight. lenin is a dangerous man but he can be stopped. so my comrades we shall siege there weapons tonight on ward. (rides away with ak(not invented yet) and sword in hand while on bear into snowstorm)