How I created the visualization: First, I analyzed the chart Conjugal Condition of Blacks According to Age Periods published on the blackdataproject website. Next, I extracted each data point from the chart and entered it into an Excel spreadsheet. The file contained four columns (AGE, STATUS, % MALE, % FEMALE) and 28 data rows (including the column header row).
Then, I imported the .xlsx file in Tableau in order to recreate the tornado (aka butterfly chart) originally published by W.E.B. Du Bois in 1900. To create the tornado chart, I used the dual axis bar chart type in Tableau. I used the same colors from the original chart to indicate the conjugal condition of person.