More historical moment in history?

[JasonDebenah89]

The fall of the Berlin Wall and the Reunification of Germany back into one country

or

The British handover of Hong Kong back to China?

[Greedo punched first]

The reunification of Germany, especially with the end of the Cold War.

[Blue3]

There's really no comparison. Germany, of course.

[Unconditional Surrender Truman]

Technically speaking, both of these events are equally historical. The fall of the Berlin Wall is clearly the more significant.

[Trans Rights Are Human Rights]

Technically speaking, both of these events are equally historical. The fall of the Berlin Wall is clearly the more significant.

[vanguard96]

Hong Kong's has kept a lot of what was set up under the British rule. Though there are pressures to reverse course and set up more protections. A lot of the opportunities there are focused on the China domestic market and job opportunities for local Hong Kongers are not as automatic as they were when China's own domestic market was less advanced in the 90's and early 00's. The jury is still out on the long-term economic success of Hong Kong as to whether it will decline. Definitely from an economic freedom standpoint it is a beacon and a focus on maintaining. The issues with personal freedom and democracy are a concern if China continues to maintain strict authority. As we saw a couple years ago with the umbrella movement there is a considerable wellspring of democratic yearning in Hong Kong.

They deserve more political autonomy. However, I wonder with the nature of mainland Chinese taking more and more of the best jobs if by ensuring democracy the people vote in legal protections & restrictions for the 'common good' that destroy the essence of what allowed Hong Kong to become what it is today and we will see a decline in its power and influence.

As for the German reunification that was a momentous event and changed Europe forever and thus the world. For instance would we even have the current Middle East / African migration crisis if there was still the "Iron Curtain" in Eastern and Central Europe? Angela Merkel was born in East Germany, for instance. Would there have been 9/11? Islamic terrorism still happened during the Cold War -
 notably the Iran Hostage Crisis and the Beirut Embassy Bombing. However under the Cold War the US for instance trumped up jihadis in Afghanistan - I am sure this would have continued and perhaps we would not have the same regime change wars we've seen since 2001.

Definitely Eastern Europe's fall set the stage for the fall of the Soviet Union - and it provided tinder for the current issues with Russia, Ukraine, NATO, EU, and so forth.

[Del Tachi]

Even though I voted for German reunification, I think a good argument could be made for Hong Kong reunification. 

The reunification of Hong Kong with Mainland China is a marquee example of 20th century decolonization, which has arguably been a greater force in contemporary geopolitics than the Cold War.