Where do tectonics activities, such as earthquakes or volcanic eruptions, tend to occur

At tectonic plate boundaries 

such as constructive plate boundaries, here volcanoes are formed

destructive plate boundaries, here earthquakes are formed

and conservative plate boundaries here earthquakes are formed

hope this helps

In the midwest because it has more moderate climate than the north or south west which makes farming far easier.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.