How did the southern defense of slavery change between the early nineteenth century and the 1850s?

Why did the south defend slavery so vigorously even though only 25% of the ... After 1830 - A number of factors (outlined below) forced southerners to change their defense. Instead ... If one considered that a slave in 1850 was worth $2000 then losing 200 slaves would mena a loss of $400,000 ... Early Childhood Education