1. Why should the farm animals live better than my people?
2. Aren't there laws against this harsh treatment?
This statement is true.
When making foreign trading policies, things like tariffs decide how many things will be imported from where. If you have a most favored nation, you give them lower tariffs and thus motivate them to trade more with you and you help their economy. There can also be an opposite when you make tariffs higher for someone in order to reduce their importing.
Native Americans were hunter-gatherers, so they saw land as hunting territory, where Europeans saw it as farmland and land to settle on. The native Americans would move around the land to hunt the animals and thus didn't claim land, but the colonist saw it as their land, so it was more important for them.
It can suddenly increase when more and more people have babies and the infant rate goes up. and how it might affect the ecosystem is the pollution that people give off.