Thomas C. Laird wrote, "
Here is a news story from China Daily about slaves, in China, in the year 2007"

I know about that, see here is another article about it

http://www.chinadaily.com.cn/china/2007-06/16/content_895699.htm

The people that were involved in enslaving were arrested. 

So how does Tibet getting its independence going to help improve human rights in the rest of China? 

You wrote, " If it were acceptable for China to invade Tibet, to 'help' the Tibetans
then China should have invaded Mississippi in the 1950's because of the
inequalities there? Or if this is true then the US should invade China,
today, because slavery is still allowed there?"

The
United States went through a civil war to keep the South united with
the North. This is evidently the goal of China, because its not only
the Tibetans that are asking for independence. 

You wrote, "The Tibetans were all slaves, and China liberated them." Its hogwash.
Tibetans, Americans, and Chinese, need to resolve their own social
ills-- without foreign invasion to 'help' them"

 No
not all the Tibetans were slaves, the aristocrat class were slave
owners. And a Nazi that visited Tibet thought this would be a good political system for Germany.

I agree that each society needs to solve their own problems. But
ever since the end of colonialism, countries like the United States and Britain have interfered with the development of Third World countries in
the Middle East, Asia, South America, and Africa.  While Western
nations preached human rights and democracy, they go around engaging in
regime change, supporting brutal dictators and kings who do their
bidding.

Why aren't people as upset about the huge amount of U.S.
debt that China holds as they are about the Olympics being held in
Beijing?