Sentence:  The opening <WSD>crawl</WSD> (and a stirring propaganda movie) informs us that “The Hunger Games” are an annual event in Panem, a North American nation divided into 12 different districts, each in service to the Capitol, a wealthy metropolis that owes its creature comforts to an oppressive dictatorship. 
Meaning of the word marked with <WSD> tags:  A piece of horizontally scrolling text overlaid on the main image.