which is the best journalism college in USA?

Answer 1

The top journalism programs in the US are Northwestern's Medill School, Columbia's journalism program and the Missouri School of Journalism. These are mainly master's level, but there is also college-level training available (for example, Northwestern has a bachelor's program in journalism).

Here is a more extensive list:
http://www.editorandpublisher.com/eandp/resources/journalism_schools.jsp