Die Hard was the first film in what would become one of the most popular franchises of the last three decades. A massive commercial success, it also created a set of expectations for the career of Bruce Willis: people expected that his every new film would start a franchise. From Hudson Hawk on, through The Last Boyscout and Striking Distance, every film was supposed to be the foundation of another great franchise.
But these other characters did not have the staying power of John McClane. It turns out that the same shit tends to only happen to the same guy once when it comes to successful film franchises (unless that guy is Harrison Ford, obviously).
Lebanon had spent the previous few years threatened by a civil war between the Maronite Christians and the Muslims who were its two major religious divisions. As a rule, the Maronites were aligned with the West, and the Muslims with Egypt under Gamel Nasser. Relations with Egypt and Syria had grown tense, further exacerbating the situation.
Finally, the toppling of Iraq’s pro-Western government on July 14 provoked President Chamoun’s call for U.S. assistance. President Eisenhower responded with Operation Blue Bat, commencing on July 15, and ultimately lasting until October 25, 1958. In that time, US forces quelled dissent and helped to stabilise the government. At the time, it was considered a great success, but there are always unintended consequences: in historical terms, however, it can be seen as one more resentment spurring Muslim extremism against the US.