Population size, density, and expenditure habits.
The correct assertion is that thunder from far-off storms often goes unheard due to the loss of sound energy and the earth's curvature. Thunder is a sound phenomenon resulting from the movement of electric charges within the atmosphere. The thunderclap originates from the rapid expansion caused by sudden heat, creating a powerful pressure wave that we recognize as sound.
The countries mentioned are Japan, Germany, and Italy. In Franklin D. Roosevelt's significant address, "Fireside chat #19," delivered shortly after the Pearl Harbor attack, he elaborated on the diplomatic history between the United States and Japan, suggesting that Japanese negotiations were insincere and masked ulterior motives. This message greatly impacted the nation, serving as a warning of impending conflict. Roosevelt asserted that for American values to be preserved, the defeat of Germany, Japan, and Italy was essential.