  This article introduces the 50stateSimulations, a collection of simulated
congressional districting plans and underlying code developed by the
Algorithm-Assisted Redistricting Methodology (ALARM) Project. The
50stateSimulations allow for the evaluation of enacted and other congressional
redistricting plans in the United States. While the use of redistricting
simulation algorithms has become standard in academic research and court cases,
any simulation analysis requires non-trivial efforts to combine multiple data
sets, identify state-specific redistricting criteria, implement complex
simulation algorithms, and summarize and visualize simulation outputs. We have
developed a complete workflow that facilitates this entire process of
simulation-based redistricting analysis for the congressional districts of all
50 states. The resulting 50stateSimulations include ensembles of simulated 2020
congressional redistricting plans and necessary replication data. We also
provide the underlying code, which serves as a template for customized
analyses. All data and code are free and publicly available. This article
details the design, creation, and validation of the data.
