[aristeides]

Didn't the 11th Amendment deny to state citizens the right to sue their states in court?

I'm not sure I would say that the 16th Amendment increased people's rights.

[AntiGuv]

The 11th Amendment and the 16th Amendment are essentially neutral in regard to the rights, liberties, and freedoms of Americans. The former did not limit one's right to sue, but rather designated the proper, responsible, accountable legal forum. The latter simply elevated a power reserved to the states up to the federal level.