I'm not sure about the Great Britain and Us conflict but I do know that the Mexican American war was the war for the possession of Texas? That may be a contrast you may include. I hope this helps.
Answer:
a. i JUST TOOK THE TEST ON USA TESTPREP.
Explanation:
Maybe just read the story a few times more and make a guess on what you think is the best answer?
Ultraviolet - (of electromagnetic radiation) having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays.