Which two countries in north america have edtablished the largest trading partner ship

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years

Its led to migrationits led to death 

The answer would be  b. hope this !

Poaching of all these specific species