The phonograph, light bulb, and the motion picture.
With the ability to forge iron tools, farming tools were more effective and provided a greater production and effectiveness. More food produced means that more people are able to be fed and consequently establish and work in the land. With a higher population and food cap, West Africa settlements were able to grow.
The answer to your question is,
Gilbert Tennant
-Mabel <3
The feudal system in the early 17th century in Japan worked fairly well
for that time period. The land belonged to all the feudal lords, who
allowed serfs to farm the land.