Why did many colonizations start near rivers?

What does this picture revesl about the the work of peasent women

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

In the latter stages of the civil war who was given the responsibility of winning the war for the north