Breaking history into distinct periods of time is an example of

Periodization

Explanation:

When we break up the past into determinate, quantifiable blocks of time , we then facilitate the approach and analysis of events of history.

The periodization is more or less arbitrary but it has turned the preferred way for grouping events and make descriptions. Usually the abstractions led to difficulties for perciving the greater panoramic view.

The periods that are given, show relatively stable characteristics so they can be put together.

Let's consider the Marxist view of History:  

According to them

   -Primitive communism

   -Slave society

   -Feudalism

   - Capitalism

   - Socialism

As we could go further, we would see that every period given here shows a specific set of characteristics and that the guiding line accounts for mechanisms that have historically accounted for the appearance of socialism.

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

native americans suffered high rates of poverty and unemployment.

during the late 1960s and early 1970sthe need for political militancy grew among the native americans. throughout the 1960s, they had been the nation's poorest minority group, the most deprived group, according to practically every socioeconomic measure. in 1970, the indian unemployment rate was 10 times the national average, and 40 percent of the native american people were below the poverty line.