Alien look at the United States

A group of alien not long ago visit earth, they want to understand us. Their adventure from the world's leading powers started to study, they tried to understand first one country, and then understand other countries.
They asked geologist: America has many countries, the country is just one of them, why it is called the United States?

They asked the army leaders: in such a never received any country bombing and the nation, why the invasion war called defense?

They asked sociologists: why the world manufacturing drugs being such a healthy social suck half off?
They asked economists: if the economy in recent 20 years doubled, why most workers work up longer than before income but as the past?

They asked the public health managers: why prohibit smoking and make cars and factories literally puffed?
They asked the leadership of the general: why crack down on drugs struggle of drug addicts and wash DuZi crowded prison held the bankers prison but empty?

They asked political scientists: why the ruler of here has been discussed for peace, and all kinds of weapons in the war of half the country is by the sale?

They asked the environmental protection expert: why the ruler of here have been talking about the future of the world, and the country is in the future of the world s caused a lot of the pollution?

They heard the more, the more he explain don't understand. The adventure for a very short time, their visit from hegemony started, the country hegemony powers over.