How did european expansion create the first global economic system?

When did paul zoll develop cardiac pacemaker

Match the events to the impact they had on africa during the late 19th century 1.colonization of the congo 2.berlin conference of 1884 3.berlin act of 1885 settled tutorial disputes between european nations prohibited the slave trade in africa marks the beginning of scramble for africa

About how many european immigrants were processed at the facilities on ellis island