The journal of someone who was present at the fall of the Berlin wall would be an excellent source, or television footage of the event, or really anything first-person. People who were actually there and participated are always the best sources for any historical event.
The fall of the Berlin Wall
The fall of the Berlin wall -APEX
what is Earth's primary energy source
The fall of the Berlin Wall -APEX
the fall of the Berlin Wall
It didn't! The fall of the Berlin Wall was the result of a "bloodless revolution".
Soviet Union
1989
1989
The Soviet Union (Russia) collapsed, the fall of the Berlin Wall was simply an indication of that collapse.
The Berlin Wall
Successful: We just flew over it and dropped supplies.