1. 2) To work together and defend each other to keep peace.
The Iroquois League was formed to protect one another from enemies. It is stated in the document that they are united for a common purpose and refers to it as the "Great Tree of Peace".
2. 1) They taught settlers how to grow crops that were traded with other countries
Crops were part of the Colombian Exchange and many of the new world crops were new to Europeans. Native Americans taught Europeans how to cultivate the American land and how to grow crops which were traded back to Europe.
3. 1) Spain wanted to discover a new land for settlement
; 2) He went in search of an easier route to Asia
Columbus was convinced he could find a western route to Asia which would be quicker. Spain agreed to endorse Columbus because of their desire for an empire. Believing there was limited resources and wealth, Spain wanted to get into the colonial race.