Figure 1.
The chart presents the number of treated counties (N) on the vertical axis against the years spanning from 1850 to 1910 on the horizontal axis. There are two distinct trend lines: one represented by blue dots and solid lines indicating statutory recognition, and the other by red dots and dashed lines indicating judicial recognition. The data flows from left to right, depicting changes over time, with both series of data showing variations in the number of treated counties associated with each recognition type. The chart includes multiple labels identifying specific states at various points along the lines and presents a clear comparison of the progression of statutory versus judicial recognition throughout the given years.The emergence of PA
Note(s): The figure depicts the number of counties in states with formal recognition of PA over time. The blue line represents the statutory recognition of PA, while the pink line denotes key court cases that recognized some aspect of PA. The vertical jumps in each line correspond to key dates, with the associated states indicated in the graph