First of all, to everyone worrying about the absorption of refugees by the South, Rowland is right. China didn't remove the borders with HK and Macau. It even created new internal borders for the SEZ's like Shenzhen, though there's little trace of those now.
Speaking of which...
I already explained it to you in the labor reform thread. If you don't believe me, go there and see for yourself! There are serious developmental problems across the land, but your caricature is straight out of the 20th century.
Also, where does your interpretation of Juche -- "pure, unadulterated Marxism" -- come from?
Tl/dr: it's a Korean ideology.
@Andrew0409, your numbers are little mixed up. The firm separation of Taiwan was in 1949, though it's not completely straightforward (Japan and all that -- 1895). Thirty years would mean, what, 1987?
Germany was divided no later than 1949 and unified no earlier than 1989 (technically 1990), so that makes 40 years, at least.
About the UK and Chinese refugees, I believe the idea Icon is refering to (unless she meant flood HK with refugees) is that if you enter the UK and promptly destroy your passport, whatever country the UK tries to deport you to can simply deny that you're a citizen, so there's a complex process to go through. As for refugees in HK back in the day, I think the process was a little different.
There was at least one major wave of mainlanders that swept across the HK border during the Cultural Revolution, but it wasn't quite clear why they were crossing (as part of a plan or just because they wanted to, or both).
The argument that really made sense to the British, as I understand it, was that HK was not self-sufficient (uh-oh, sounds like Juche! ), so China could simply cut off the food supply, and then the cost of maintaining the colony arguably would have outweighed the benefit of keeping it.