What’s the principal of federalism ?

Federalism. The last key element of America's system of limited government is the principle of federalism. In a federal system, some key powers are held by a centralized national government while others are reserved for the various states governments. American federalism existed even before the Constitution.

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .