Bull**** bureaucracy aside, China has as much control over Hong Kong as it's ever going to get without straight up war. The people are already rioting over any small bill that would even only theoretically give the mainland more leverage.
China thought that they'd get over it. They haven't. If anything, the next generation is even more staunchly opposed to them than all the people who were freaking out in the '90s.
In the end, the people don't give a **** about treaties and political agreements. They just wanna do their thang without being erased for political dissent. If it comes down to it, they'll realign with England in a heartbeat.
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