Very nice summary. Yes, it wasn’t the Connecticut Compromise that created the Constitution of 1789 (lower house representation based on populuation, upper house representation based on statehood). Instead, it was the Three-Fifths Compromise that gave southern slave states 3/5 representation for their slave population for the purposes of the electoral college and for Congressional Representation. That clause enabled the racist democrats (who remain racist to this day) to dominate national politics.
But the forces that prompted the southern states to push for the Three-Fifths Compromise, the growing industrialization and population of the North, where overwhelming the effect of the compromise. Looking at your shifting maps, you can see that trend of the national electorate was swinging away from slavery and would never come back. The line drawn by the Missouri Compromise made that apparent. By the time Chief Justice Taney declared the Missouri Compromise unconstitutional in Dred Scott v. Sanford, it was too.
The money, industry and people were in the north. And with it would come political power. Matching the industrialization of the north was an impossibility in 1855, and the south would not really industrialize until the advent of air conditioning a century later.
Perceptive southerners realized that Secession was the only way they could maintain their political and social system, and the window of opportunity was closing.
Before the slave was the indentured servant. This all speaks to the nature of man.
https://www.teachervision.com/slavery-us/resource/3848.html
Indentured Servants’ Experiences 1600-1700
BEFORE THE JOURNEY: “Many of the spirits [people who recruited indentured servants] haunted the London slums and those of Bristol and other seaports. It was not difficult to find hungry and thirsty victims who, over a dinner and much liquor, would sign anything before them. The spirit would then hustle his prey to his headquarters to be added to a waiting company of others, safely kept where they could not escape until a ship was ready for them. An easier way was to pick up a sleeping drunk from the gutter and put him aboard a vessel for America, where, with no indenture, he could be sold to his own disadvantage and with the American planter’s gain. Children were valuable and could be enticed with candy to come along with a spirit. Sometimes they, and older people too, were seized by force.”
The legal evolution:
http://memory.loc.gov/ammem/awhhtml/awlaw3/slavery.html
Virginia was one of the first states to acknowledge slavery in its laws, initially enacting such a law in 1661.36 The following year, Virginia passed two laws that pertained solely to women who were slaves or indentured servants and to their illegitimate children. Women servants who produced children by their masters could be punished by having to do two years of servitude with the churchwardens after the expiration of the term with their masters. The law reads, “that each woman servant gott with child by her master shall after her time by indenture or custome is expired be by the churchwardens of the parish where she lived when she was brought to bed of such bastard, sold for two years. . . .â€37
The second law, which concerned the birthright of children born of “Negro†or mulatto women, would have a profound effect on the continuance of slavery, especially after the slave trade was abolished—and on the future descendants of these women. Great Britain had a very structured primogeniture system, under which children always claimed lineage through the father, even those born without the legitimacy of marriage. Virginia was one of the first colonies to legislate a change:
The social/business/political beginnings:
http://www.ushistory.org/us/5b.asp
Virginia and Maryland operated under what was known as the “headright system.” The leaders of each colony knew that labor was essential for economic survival, so they provided incentives for planters to import workers. For each laborer brought across the Atlantic, the master was rewarded with 50 acres of land. This system was used by wealthy plantation aristocrats to increase their land holdings dramatically. In addition, of course, they received the services of the workers for the duration of the indenture.