Some historians call the soviet-afghan war the soviet union’s “vietnam.” what do they mean by this reference

We gained nothing from the Vietnam war, so it is reasonable to say that the Soviet Union gained nothing from the Soviet-Afghan war.

Afghanistan became an intractable situation for the Soviets. The invasion occurred in 1979 and the Soviets withdrew 10 years later have invested manpower and resources to no avail.

Explanation: The Soviet -Afghan war was a protracted conflict in which the Soviets invested money and resources with no real results or a positive outcome.

since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.