@article{
doi:10.1073/pnas.2120510119,
author = {Dallas Card  and Serina Chang  and Chris Becker  and Julia Mendelsohn  and Rob Voigt  and Leah Boustan  and Ran Abramitzky  and Dan Jurafsky },
title = {Computational analysis of 140 years of US political speeches reveals more positive but increasingly polarized framing of immigration},
journal = {Proceedings of the National Academy of Sciences},
volume = {119},
number = {31},
pages = {e2120510119},
year = {2022},
doi = {10.1073/pnas.2120510119},
URL = {https://www.pnas.org/doi/abs/10.1073/pnas.2120510119},
eprint = {https://www.pnas.org/doi/pdf/10.1073/pnas.2120510119},
}