Answer:
The river caused the erosion of the canyon.
Explanation:
because it is one of the best arming areas in the word yes
1: they feared that they would get deported by the imgration officer.
2: they also feared that there family member(s) would get sent back
3: lots of people had different types of diseases and they thought they would catch them and get sick.
4: had fear of getting lost.
5: most of them didn't have family there so they were worried that they would have to live on streets or that they might jot get a job.
hope these were enough reasons. there r more reasons but these were the only ones i knew of so yea.
It could be increased greenhouse gas effect.
