Anthropologist Jason De León uses a four-field anthropological approach when studying the experiences of Mexican migrants attempting to cross the U. S. border. Identify the reasons he gives for his use of the four-field approach.

To combine his background in both ethnography and archeology to make a research study.

Explanation:

In his bid to study the experience of Mexican migrants attempting to cross U. S border, Joan De Leon used four field of anthropology to make the research

In his research work, titled The Land of Open Graves: Living and Dying on the Migrant Trail (University of California Press), which was published in 2015, he explained that, the reason for using four field of anthropology is to find the cultural background relationship, the linguistic aspects, the biological integration: forensic science, and as well the archeological endeavor that is involved.

In other words, Joan De Leon reason for using four field of anthropology for his research study, is to find, how undocumented migration is a global phenomenon, as it is not just a desert situation only, but stretches from North to South, involving all kinds of intellectual, methodical and political processes.

De León's research was in response to (and criticizing) the federal border enforcement policy. The policy turned a blind eye, and did not stop the crossing of migrants in high risk areas, that were characterized by extreme environmental conditions, that were life threatening.

Explanation:

The four major fields De León used were:

Forensic Science Ethnography Archaeology Linguistics