Some good points here.

Russia never learned no doubt, nor do we.

It took just one American president to stand up to the Evil Empire instead of enabling it. Military strategy all served the USSR in WW2. There was nothing necessary about keeping all the allied American and British force fighting in the West of Europe and allowing the Soviets a free hand in the East.

If the USA then had a change of heart and wanted to defeat the USSR then they would not have adopted a policy of "Containment" that forbade US forces from impeding upon the Soviet Empire's usurped territories.

You can liberate only South Korea. You cannot intervene in Hungary, Poland or East Germany etc.
You cannot use overwhelming force.

I hope we have learned these lessons but I doubt it. I could wish we learned an even greater lesson: not to intervene in endless European and Asian quarrels. Our quarrel in WW2 was with Japan but FDR concentrated on Germany instead. We knew about the vlnerability of Pearl Harbor long before the attack but left it insufficiently defended.

The main lesson of the Berlin Wall is to pick an enemy like Gorbachev to roll over and play dead. If the witless Reagan had rattled his nukes in the face of a more ruthless Soviet leader, we'd all be sitting in our ashes now.

This remenber when a lived in Nogales, Arizona and they try to made a wall between US and Mexico i think we shout not have walls we all humas no matter skin, religion, sex or race.

Lesson learned: Everything must pass! Even ALL great empires will eventually fall. Lessons coming to all of us!

The Wall fell??? USSR doesn't exist anymore??? Somebody should tell Glenn Beck.

There is a wall being build today which will become more infamous than the former Berlin Wall.

It is the separation wall between the Israels and the Palestinians.

While the Berlin Wall was built with Soviet help the separation wall is being built with US help.

Fences and walls never make for good neighbors.

The Berlin Wall was to stop people escaping to a free nation from an unfree nation.

You seem to referring to a wall for making people enter another nation in a legal way. There was no legal way for anyone, except politicians and spies, leaving East Germany for the West.