Although slaves had been sold in the American colonies since at least 1619, slave labor did not come to represent a significant proportion of the labor force in any part of North America until the last quarter of the 17th century. After that time, the numbers of slaves grew exponentially.
A Pharmacologist earns an average salary of $103,686 per year. For the first five to ten years in this position, salary increases sharply, but any additional experience does not have a big effect on pay.
The BLS reports that the median salary for clinical laboratory technicians was $38,370 in 2014. The best-paid 10 percent in the profession made approximately $59,750, while the bottom 10 percent made approximately $25,500. Top-paying metropolitan areas for this occupation include Providence, Rhode Island; San Francisco; and San Jose, California.