Why was Pol Pot never brought to trial for his crimes?

In what way did expansion and global trade during the 15th to 18th centuries affect the economies of european countries?

Which of the following is not true of television journalism? television is even more effective than the radio as an agency for influencing public opinion. you must pay millions of dollars to build up and project the proper television image for their candidates. television media performs a public service in the field of political education. we should form our opinions by listening to network commentators to get a well-rounded perspective, as you can assemble from different sources we should listen to more than one commentator and read background articles in boo and magazines

What was the effect of the industrial revolution on the working class?