April, 1989: Tiananmen Square
Dec. 31, 2007: European Union drops all borders (EU countries have essentially become like U.S. states)
Jan. 20, 2009: Barack Obama sworn in as US President
April, 1989: Tiananmen Square
Dec. 31, 2007: European Union drops all borders (EU countries have essentially become like U.S. states)
Jan. 20, 2009: Barack Obama sworn in as US President
EDIT: The Berlin Wall would eventually come down at some point even if the Soviet Union was not on the verge of collapse. Tiananmen Square was a tragic event, but these types of events happen periodically. The European Union is the closest that comes to what I was looking for. Obama's election was just another day for me.
What I am looking for are things that people thought were truely impossible, something so remarkable that it took your breath away, either for the good or the bad.
The Moon Landing / Space Race was all about the pomp and drama - it was a race. I'd say the Berlin Wall had that level of impact.
The EU? No one really noticed that - and their still arguing over it.
I suppose it depends on how we define a "defining moment".
EDIT: Before man on the moon, I think the event that previously rose to that same level was the first atomic bomb. Before that, Kitty Hawk. That's the level of significance that I am talking about, the moments that make you go "holy crap!" Now that I think about it, the EU is not even close. Sputnik doesn't even rise to the level of significance I am looking for, though it certainly comes close.