What caused European imperial powers to take an interest in colonizing Africa after the slave trade ended

Could anything have been done through compromise to stop it, or did it have to happen?

Which of the following was probably the most difficult challenge facing construction of the railroad?

How did president wilson compensate for the reduced government income resulting from his lowering of tariffs? a. he taxed businesses b. he charged federal interest on loans c. he cut government expenses d. he created an income tax