Communication as "who, says what, in which context/channel, to whom, with what effect" was coined by

Harold Lasswell was the one who defined communication as "who, says what, in which context/channel, to whom, with what effect." Lasswell, who was often described as “one man university”, was an American communication theorist and one of the most respected researchers in the social sciences.

the answer would be in this answer. someone already asked the question.  

b. the american revolution