Hich best describes why nato was formed in 1949? a) the growing threat of a soviet attack led leaders of western european countries, the united states, and canada to form an alliance through a treaty. eliminate b) the energy crisis led the united states to form an organization that controlled the rate of petroleum production as well as consumer price. c) multiple wars in the 20th century led world leaders to form an organization that agreed to solve matters peacefully. d) growing world trade relations led world leaders to create a regulatory trade organization.