It means that you follow the laws, vote, and are loyal to your country.
It is true that the most horrendous terrorist act in the United STates in the 1990's was the bombing of the Murrah Federal Building in Oklahoma. Timothy McVeigh and Terry Nichols made, planted, and activated several bombs at the federal building. There were 168 people killed on this day and more than 680 injured.
Because it was considered one of the holiest places in Europe.
Generally speaking, unequal distribution of wealth means that land and money are controlled by a small few, who usually have control over these things because they've manipulated the legal system in a way that favors them.
A failure because so many incidents so some consider it a failure
