Why did the Soviets invade Afghanistan?

In December 1979, in the midst of the Cold War, the Soviet 40th Army invaded Afghanistan in order to prop up the communist government of the People’s Democratic Party of Afghanistan (PDPA) against a growing insurgency.  At the time, the United States had been making headway in the Middle East at Moscow’s expense, successfully courting Egypt, Israel, Saudi Arabia, Pakistan, and others. The Soviet Union feared the loss of its communist proxy in Afghanistan.

Explanation:

(I search it on Internet.)

probably that america is racist

the neolithic revolution began the era of permanent societies, the reliance on the limited amount of land gave way to political organization and this political organization caused social organization which was divided by amount of property and power.

the neolithic revolution (new stone age) was the first agricultural revolution. it was a gradual change from nomadic hunting and gathering communities and bands to agriculture and settlement. this period is described as a "revolution" because it changed the way of life of communities which made the change.

sentence:

let´s farm and domesticate these animals so we do not be hunting in the woods all the time