What did many english settlers hope to gain by leaving their native land and settling in the new world

English settlers main hope was to gain land in the new world that they could use for farming. This would enable them to make money from selling crops. They would then pass the land to their sons keeping the family prosperous. 
There were other settlers that left to escape persecution (mostly religious persecution). 

Idon’t understand your question but if u mean the difference in america vs in africa