What caused heightened tensions in europe after 1900?

Why did river valleys most farming impact the lives of neolithic peoples?

How can we stop u.s. military drone strikes from hurting innocent people

Plz which of the following statements about spanish plantations is not accurate? a. spanish plantations grew sugarcane for export to spain b. the spanish had little concerned for the lives of the indians who worked on the plantations. c. spanish plantations grew wide variety of crops and center produce to many different european countries. d. to replace the native americans our dying off the spanish imported african slaves.