This is True the fertile crescent now does have mountains surrounding it but that is far enough away that it is still easy to invade, the type of land and the lack of mountains made the area very good for agriculture and living.
Columbus was going to india when he accedintly went to the united states that is how the united states was discovered
and then most europians went there
hope this helps:)
Ur mom and dad and brother and sister
Answer:1-infectious Eurasian diseases
2-attempts of assimilation (and Manifest Destiny)
3-relocation attempt (Indian Removal Act of 1830)
4-diminished food supply for nomadic tribes
5-the introduction of horses and other animals to the new world (through the Columbian Exchange)