%0 Journal Article %T Introducing the Historical Varieties of Democracy dataset: Political institutions in the long 19th century %A Agnes Cornell %A Brigitte Seim %A Carl Henrik Knutsen %A Daniel Pemstein %A Daniel Ziblatt %A Haakon Gjerl£¿w %A Jan Teorell %A John Gerring %A Kyle L Marquardt %A Svend-Erik Skaaning %A Tore Wig %J Journal of Peace Research %@ 1460-3578 %D 2019 %R 10.1177/0022343318823866 %X The Historical Varieties of Democracy dataset (Historical V-Dem) contains about 260 indicators, both factual and evaluative, describing various aspects of political regimes and state institutions. The dataset covers 91 polities globally ¨C including most large, sovereign states, as well as some semi-sovereign entities and large colonies ¨C from 1789 to 1920 for many cases. The majority of the indicators come from the Varieties of Democracy dataset, which covers 1900 to the present ¨C together these two datasets cover the bulk of ¡®modern history¡¯. Historical V-Dem also includes several new indicators, covering features that are pertinent for 19th-century polities. We describe the data, coding process, and different strategies employed in Historical V-Dem to cope with issues of reliability and validity and ensure intertemporal and cross-country comparability. To illustrate the potential uses of the dataset we describe patterns of democratization in the ¡®long 19th century¡¯. Finally, we investigate how interstate war relates to subsequent democratization %K democracy %K democratization %K political institutions %U https://journals.sagepub.com/doi/full/10.1177/0022343318823866