In creating this visualization, I first charted the country of origin and the date of arrival. Then, I further filtered the map by looking at a chart of gender, and which years numbers of different genders came. The graph compares the amount of men and women arriving in the 1800s. Specifically, I am looking at the years 1820,1830, and 1848.


In the year 1820, the amount of slaves arriving dropped dramatically. 1820 is one of the lowest points on the graph in terms of both men and women arriving. The spatialization of data on the graph allowed for me to very easily see at which points the numbers were the lowest. Based on this dip in numbers, I did some research on why this might be. In 1819, a bill was passed that allowed armed cruisers to patrol the coasts of the United States and Africa to supress the slave trade. Another act in 1820 ensured that the slave trade was came under piracy laws, which was punishable by death. Ships were despatched to defeat slave traders and pirates. So laws and policies in and around 1820 provide some explanation for the drop in slave arrival.
In 1830, there was a spike in the arrival of slaves. This spike is one of the highest on the chart. Something I found interesting about this year was the ratio of men to women slaves was closer to equal than at any other year on the graph. The var graph as a mode of visualizing allowed me to see this phenomenon very clearly. As Drucker discusses, visualizing data in the most fitting form is essential in preventing distortion or misinterpretation, and in allowing the viewer to gain the most knowledge from the visualization. The bar graph allowed for me to understand both the overall amount of slaves arriving at certain dates, and to compare the amount of each gender arriving. In terms of why so many women arrived in 1830, I did not find a lot of historical explanation. One theory I had was that the spike in slaves arriving in and around 1830 made Nat’s Rebellion, which occurred in 1831, more possible. The increase in slave numbers could have increased confidence and a “strength in numbers” mentality that fueled the rebellion.
In 1848, there was another big spike. This spike was interesting because again, it is one of the largest spikes on the graph, and it is surrounded by very low numbers in slave arrival. One possible explanation for this drastic increase in arrival is the Mexican-American War, in which the United States gained control of the Mexican territory. With this new area, there was bound to be some expansion and demand for more slaves, despite general anti-slavery sentiment that was growing in the country. Additionally, reports from this time showed that American ships were not pursuing slave traders.
I think the visualization of how many male and female slaves came in the span of years is a generation of knowledge, not merely a representation. I created the gender visualization by filtering a larger visualization. From the gender graph, I then identified interesting time periods in which the arrival of both or one of the genders charted was significant. This data is generated knowledge because it is filtering knowledge that was already graphed, and displaying it new ways that lead to new conclusions. Although, as Drucker states, all visualizations are representations, or substitutions of data that pass themselves off as presentations of the information itself, focusing in on specific data points does generate more knowledge about the data set, regardless of whether that knowledge is wholly accurate or not. Charting specific parts of a larger data set, and then narrowing in on even more specific dates reveals insight that could not have been generated otherwise.






















