Choose the two most common ways to organize institutions of the central government. Oligarchial system of government
Unitary System of government
Totalitarian System of government
Federal System of government

Unitary System of government

Federal System of government

Explanation:

In unitary republics, the central government may produce (or abolish) administrative departments. Such factors operate only the authorities that the central government wishes to select. ... A great majority of the world's countries (UN member states) have a unitary system of government.

A federal system of government is one that distributes the authorities of government between the national (federal) administration and state and local administrations. The Constitution of the United States authenticated the federal system, also recognized as federalism.

pan-africanism or pan-africanism is a political, philosophical, cultural and social movement that promotes african twinning, the defense of the rights of african people and the unity of africa under a single sovereign state, for all africans, both africa as of the african diasporas.

it is relaxation hope this