<Li> 1900--British Crown assumes governance of Nigeria and part of Cameroon </Li> <Li> 1914--1 January--Southern and Northern Regions amalgamated, though administered separately, under British colonial rule executed by Governor General Frederick Lugard . </Li> <Li> 1941--14 August--Atlantic Charter issued by Britain and the United States promises self - determination and sovereignty for "all peoples". </Li> <Li> 1946--Richards Constitution subdivides Southern Region into Eastern Region and Western Region; reasserts the Crown's ownership of "all mineral oils" in Nigeria . </Li>

Who was involved in the nigerian civil war