Movie is called The Land before Time Critique.

What geologic era is this movie based upon?

The Land Before Time suggests that the series takes place at the end of the Mesozoic Era

was a long, primarily nonviolent series of events to bring full civil rights and equality under the law to all americans. the era has had a lasting impact on united states society, in its tactics, the increased social and legal acceptance of civil rights, and in its exposure of the prevalence and cost of racism. in the south violence and fraud in southern elections from 1868 to 1876, which had reduced black voter turnout and enabled southern white democrats to regain power in state legislatures across the south

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.