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.

it was the first amendment

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.