In the 1970s British historians John Gallagher (1919–1980) and Ronald Robinson (1920–1999) argued that European leaders rejected the notion that "imperialism" required formal, legal control by one government over a colonial region. Much more important was informal control of independent areas. According to Wm. Roger Louis, "In their view, historians have been mesmerized by formal empire and maps of the world with regions colored red. The bulk of British emigration, trade, and capital went to areas outside the formal British Empire. Key to their thinking is the idea of empire 'informally if possible and formally if necessary.'" Oron Hale says that Gallagher and Robinson looked at the British involvement in Africa where they "found few capitalists, less capital, and not much pressure from the alleged traditional promoters of colonial expansion. Cabinet decisions to annex or not to annex were made, usually on the basis of political or geopolitical considerations."