Answer:
For Mexico, this was itself a provocation, but Polk went further, sending U.S. Army troops to the area; he also sent a diplomatic mission to Mexico to try to negotiate the sale of territory. ... Mexican forces attacked U.S. forces, and the United States Congress declared war.
Explanation:
The answer is D. flashback, to give the reader background
information. It is a literary device wherein the author depicts the incident of
specific events to the reader, or events that have happened before the events
that are currently unfolding in the story which have taken place before the
present time the narration is following,.
