"You furnish the pictures, and I'll furnish the war" shows a late 19th century type of yellow journalism. It is a form of journalism that is based upon sensationalism and crude exaggeration. For example, "equating murder and dismemberment with smoking pot" is the worst yellow journalism.

The first time the above quote occurred William Randolph Hearst, known for developing the nation's largest newspaper chain and media company, was communicating with Frederic Remington. When Remington, a 'New York Journal' artist employed by Hearst, cabled from Cuba in 1897 that "there will be no war", Hearst cabled back: "You furnish the pictures and I'll furnish the war."

Yellow journalism and the yellow press are American terms for journalism and associated newspapers. They present little or no legitimate well-researched news. They instead use eye-catching headlines for increased sales. Techniques may include exaggerations of news events, scandal-mongering, or sensationalism. The phrase was coined in the 1890s to describe the tactics employed in furious competition between two New York City newspapers, the 'World' and the 'Journal'.

During its heyday in the late 19th century, yellow journalism was one of several factors that helped push the United States and Spain into war in Cuba and the Philippines. It excited and influenced Americans. Next, it was skillfully used to lead the USA into the acquisition of overseas territories such as American Samoa, Puerto Rico, and Guam.

More Info: en.wikipedia.org