Based on the information in the timeline, which causal explanation for u. s. involvement in world war ii is most likely accurate? a. the united states became involved in world war ii to weaken the alliance of germany, japan, and the soviet union. b. the united states entered world war ii because both japan and germany declared war on it. c. the united states entered world war ii because japan attacked its navy. d. the united states became involved in world war ii to protect european allies attacked by germany.