Which event surrounding world war 1 had the greatest impact on american

What is walt whitman's poem "when i heard the learn'd astronomer about?

Which of these statements describes a long-term impact of european imperialism in africa? a. african countries joined together to present a united front against imperialism. b. europeans paid african countries after colonizing them, offering these new countries a fresh start. c. european powers drew the current borders, splitting ethnic groups among modern countries. d. africans became more loyal to their countries than to their ethnic groups.

What were some of the most important native items adopted by europeans ? what impact did they have on european life ?