I think a better summary would be: Chile told Bolivia after Bolivia tried to screw it over on an international treaty, and Bolivia dragged Peru into it. It's an interesting history from many perspectives: https://en.wikipedia.org/wiki/War_of_the_Pacific
When you defend, print out your slides; at least enough for your committee and you. Then if all else fails, you can present off the paper copies. (also, it gives the committee members somewhere to write notes and to easily look back to previous slides.)
18 And Jesus, walking by the sea of Galilee, saw two brethren, Simon called Peter, and Andrew his brother, casting a net into the sea: for they were fishers.
19 And he saith unto them, Follow me, and I will make you fishers of men.
20 And they replied back saying, Very well O Lord but there are six fish who have grievously insulted us.