What legislation did president bush sign shortly after the september 11 attacks that raised concerns about possible violations of civil rights?

The answer is Patriot Act. The USA Patriot Act is an acronym for Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism. The USA Patriot Act was passed by Congress as a reaction to the psychological oppressor assaults of September 11, 2001. 
Authoritatively known as the Uniting and Strengthening America Act by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 or "USA Patriot Act" the law is expected to enable government offices to recognize and forestall conceivable demonstrations of fear based oppression or sponsorship of psychological oppressor gatherings.

Both countries had to aprove annexation.