Answer:
Because of the Smallpox epidemic
Explanation:
This question is a little ambiguous as it doesn't give reference to what 'favourable' is but I've attached a diagram that depicts the different types of climate in Brazil to help.
(This is more of a geography question than history)
Italians for all smuggling, guntrade, alcohol trade, rackets etc
Asians 'cause of the conflict with Japan in World War 2 eg: Pearl Harbour, Hiroshima/Nagasaki nukes.
Spanish. America have always hated the spanish.
Russians due to the clash of left/right wing politics.