Why did the Soviet Union invade Afghanistan in 1979? And what was the US response?

by Twittermon

some say they wanted more land, others say they wanted to establish a communist government, what do you belie ve

jberd45

I have a follow up question related to this: How accurate was the move "Charlie Wilson's War"? If you aren't familiar with the movie it is the story of Charlie Wilson, a senator from Texas, who pushed for U.S backing of the rebel Afghan soldiers fighting the Soviet army.