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.

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery