What advances were made in transportation and communication in the 1920s and 1930s

 Automobiles and airplanes were made for transportation. Radios and movies came out as well, thus improving communication.

yes.

explanation:

because it let the japanese know who had the upper hand in the war.

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.