"But the economics changed. By 1807, the British West Indies finally had as many slaves as the plantation owners wanted--saturation had been reached. There was also the example of Haiti--as to what could happen with a huge numerical imbalance in favor of slaves--and the British and Americans both noted that."

          Ron - These are all good points, and economics change all the time. The same concepts could be used to address the problems of illegal aliens coming into the US now. Haiti is a good example of where we are all likely to end up if something isn't done to curb human migration.