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If you have only received the 1st letter so far since you submitted in 2001, there is a problem. You have to send a inquire letter to CIC. They at least will give you a reply once.

Most of people who sent the application in 2001 have been landed in Canada. Only quit a few people have received the 2nd letter since they submitted application after 911 in 2001, but still waiting for Backgeound check.

Here is my question to you:
1. When you cam to USA?
2. How long you have worked in China?
The questions are the key facts which may effect the processing time.

Good luck to you!