The answer is New York. Two famous newspapers in the city of New York practiced Yellow Journalism, in order to increase their readership, become more popular and called for war with Spain.
Yellow Journalism is an American term which is used to describe newspaper that use eye-catching, sensational headlines without proper research or reporting, simply to get people to buy their newspapers.
Scandals, exaggerations, twists, Wars and even sometimes complete lies are told in order to create an impact and an interest.
In the UK, this is similar to what can be described as Tabloid.