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.
Their lengthy training qualifies hospital pharmacists for salaries averaging more than $100,000 per year. The average hourly wage of hospital pharmacists came to $53.27 as of May 2011, according to the U.S. Bureau of Labor Statistics.