Positive effect is the usage of more land whereas negative effects is the control problem of that land.
<h3>Effects of settling the west</h3>
The positive effect of settling the west is that it provides America more land to use and its resources for the betterment of the economy while on the other hand, the negative effect of setting the west is that it was more land to control for the United States as well as the United States had to fight 2 wars to gain the territory.
<h3>Effects of railroads on the physical environment</h3>
The main disturbances caused by railways are air, soil and water pollution and noise which adversely affect species and organisms present in that environment.
Plantation agriculture is generally referred to as a Large farm that is mostly based on a particular crop. Often Cash crops are usually cultivated and later harvested to sell to make a profit. It is also the concept of growing vast amounts of cash crops to be sold at the market for personal profit.
Hence, in this case, the correct answer is "PLANTATION AGRICULTURE"
The knights and the samurai shared lot of similarities in their social status and their purpose in the societies. Both of the were protectors of the leader of the country. For their services of protection they were given free pieces of large parcels of land. They were the best warriors in their respective societies, and when there was a battle they were the elite unit that usually was the one that was winning the battle/war. Their only job in the society was to train for battle, and fight in battle.
