Taking a look at the Hong Kong dollar as another example of a pegged rate. Why would it still be pegged to the the $US as opposed the the Chinese

Taking a look at the Hong Kong dollar as another example of a pegged rate. Why would it still be pegged to the the $US as opposed the the Chinese Yuan?

There are two hard reserve currencies in the world which are supposed to be independent,USD and the Euro. The USD has dominated the world trade and investment of about 40%,so but naturally like...