Answer:
Both increases exports and decreases imports.
Explanation:
The navigation act's reflect the economic policy of mercantilism because in the navigation act's were acts promote to acquire self dependency of the British empire and decreasing dependency on the goods imported from other countries, while mercantilism is a policy in which exports are increases and imports are decreases. So we can say that navigation act's is the same to mercantilism.
I'm not sure if you made a typo or not but in the current context I can only see negligible being relevant.
Answer:
The Great Plains has good farmland, As the land there is highly fertile & high in humus content.
Hope it helps!