explain genes allusion to the "magot line" at the end of the book.

After World War I and building up to World War II, France had built the Maginot line. The line is basically a series of military fortifications along the French-German border. Finny did not see the world like this: he saw no enemy. He did not have lines of defenses protecting his emotions and psyche. Finny was genuine and Gene admired him for this.