The word which means "can be helpful or harmful depending on the point of view" is beaver. Beaver can both have a good and a bad effect to the ecosystem. In a good point of view, beaver serves as natural filters segregating sediments from flowing to bodies of water. On the other hand, it can also cause flooding.
Answer : As the US expanded after the Revolutionary War, the Northwest Ordinance of 1787 helped organize the new territories and set up the steps each territory needed to take in order to become a state. It is interesting to note that the Northwest Ordinance outlawed slavery in the Northwest Territory.
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Berlin Conference (1884-85) was held by the European nations to scramble Africa among themselves with the aid of diplomacy or by weapons. The conference had positive as well as negative effects. Africans had lost their lands.
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