This excerpt is from book named "Unbroken" by an American author named Laura Hillenbrand.
The author interrupts Louie's narrative with information about Japan and Germany.
Explanation: The writer provides the information about Japan and Germany so the reader has the background knowledge needed to better understand how Zamperini’s life might change because of war. Louie has participated in the German Olympics, and he is setting his sights on the Japan Olympics in 1940. The author writes about Germany and Japan to show that the world around Louie is changing and provides the reader with some foreshadowing that Louie’s plans may not happen as he intends.
