Which discipline us to understand the past by studying the physical features of the environment?

Archaeology is the correct answer.

Explanation:

The study of human past through the analysis and recovery of the material culture is known as Archaeology. It is  a branch of both the humanities and social sciences and a sub field of Anthropology. The goal of archaeology includes reconstructing the past life ways and understanding the cultural history. Surveying, Excavation and analysis are used for knowing about the past. It mostly developed in Europe in 19th century.

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