Short answers, pulled from the story.
The word pop first appeared in 1947 in a collage titled I was a Rich Man's Plaything created by Eduardo Paolozzi. This image emerged from a cloud of smoke in a revolver aimed at a smiling woman's head and became the initial bearer of the term pop art.
The term pop art was first coined by John McHale in 1954 in conversation with Frank Cordell. The specific term first appeared in published print in the article But Today We Collect Ads by IG members Alison and Peter Smithson in Ark magazine in 1956.
Andy Warhol held his first solo exhibition in Los Angeles in July 1962 at Irving Blum's Ferus Gallery. He showed 32 paintings of Campbell's soup cans, one for every flavor, and sold the set to Blum for 1,000 dollars.
Roy Lichtenstein created the work Drowning Girl in 1963. The painting was appropriated from the lead story in DC Comics' Secret Hearts number 83 and is part of the collection of the Museum of Modern Art.
The São Paulo 9 Exhibition, Environment U.S.A.: 1957 to 1967, took place by 1968. The exhibit was curated by William Seitz and featured the Who's Who of pop art including Edward Hopper, James Gill, Robert Indiana, Jasper Johns, Roy Lichtenstein, Claes Oldenburg, Robert Rauschenberg, Andy Warhol, and Tom Wesselmann.