Compared to the scene in New York, the Pop Art Movement in Los Angeles was much more relaxed due to the absence of galleries and critics of the East coast. This relaxed idea was reflected in the styles of the LA artists. The NY Movement was much more rigid and controlled and relied heavily on feedback from art critics to succeed. 

The French referred to their Pop Art Movement as Nouveau Réalisme. This term means "a new way of perceiving the real." Although the movement had similarities to the American Pop Art Movement, the French focused more on objects than paintings.

All artists but Klimt were members of the global Pop Art Movement. Yves Klein was a member of the French movement, Gerhard Richter of the German movement, and Robert Down of the Los Angeles movement. 

Andy Warhol is the Pop Artist best known for his use of repetition. Some of his most famous uses of repetition include prints of the Campbell's soup can and his vividly colored portraits of celebrities.

This was the work of Monet, and is one of his most well-known collections.

All the painters listed, other than Renoir, died before most of the paintings in the series were created.

Van Gogh was listed due to the similar themes of nature, and the similar brushstrokes often employed by both.

Image is in the public domain, accessed through Wikipedia Media Commons: https://commons.wikimedia.org/wiki/File:Claude_Monet_-_The_Water_Lilies_-_The_Clouds_-_Google_Art_Project.jpg

While all of the answers are artists groups, it was the Vienna Secession that Klimt helped found in 1897. The group's members broke from the Association of Austrian Artists as a protest of that group's conservatism.

Work is in the public domain, image accessed through WikiArt: http://www.wikiart.org/en/gustav-klimt/portrait-of-adele-bloch-bauer-i-1907-1

Like many other pop artists, Jasper Johns (b. 1930) used familiar symbols in odd or surprising ways to invert the expectations and conventions of high vs. low art. Instead of utilizing commercial products or elements of low culture, however, Johns preferred images of Americana, like the American flag. Johns' series of paintings on the American flag include an all-white flag, a pastiche of multiple sized flags, and flags where the colors are smudged and running into each other.

During the Spanish Civil War, Francisco Franco's nationalist troops destroyed the Basque city of Guernica in a massive bombing campaign assisted by Nazi German and Italian Fascist troops. The painter Pablo Picasso made a massive black and white painting depicting the event in cubist and abstract imagery conveying sorrow and devastation. After Franco took over the reins of state in Spain in 1938, Picasso was not allowed in his native Spain.

The Virgin of Guadalupe was an apparition of The Virgin Mary, which appeared to an indigenous Mexican named Juan Diego, in 1531. This was widely promulgated as the impetus for mass conversions among native Mexicans, and it became a national symbol of Mexico. The Virgin of Guadalupe, identifiable through her blue cloak, pose in prayer, and the light emanating around her, is one of the most widely used images in Mexican folk art.

"The Factory" became known in the 1960s for the parties thrown there by its owner, Andy Warhol, but in all of its locations in Manhattan, Warhol used it as a working art studio. Due to Warhol's fascination with screen printing and other mechanical forms of reproduction, the name was fitting, as it featured many apprentices making various works. Warhol also gathered a variety of people there to make art in a variety of types.