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.

answer; (a) he was a u.s senator for 38 years;

on this day in 1913, henry ford installs the first moving assembly line for the mass production of an entire automobile. his innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes.