Answer:
The high incidence of disease spread from Europeans to
American Indian populations
weakened American Indian tribes significantly, making them more vulnerable to European invasion.
Explanation:
The population of American Indian tribes was greatly decimated by diseases, especially smallpox and other communicable diseases. Most of the diseases were brought by the Europeans who had developed immunity to the diseases, and as a result did not suffer from the diseases but were able to spread the diseases whenever they had contact with the native Indian tribes.
Im not sure but i need the answer as well.
I believe this act allowed for the legal extraction of guano from Pacific islands for their rich phosphate content for fertilizer and gunpowder. Alexander von Humboldt first publicized the value of guano as having like 50 times the phosphate of other phosphate deposits when he sent samples of it from Peru to Europe..