The first reason is their size. They are very small and are very difficult to see. Special technology needed to be developed in order to observe them and their behavior and reach the conclusion that they were in fact infectious agents that could cause diseases. This wasn't possible before because the microscopes weren't as well developed.
Another is that they have a very long incubation period. This means that if you have them, a long time will pass before they start harming you which meant that many people believed them to be harmless since they couldn't track their behavior over a longer time period, also due to the lack of good technology.
Answer:
By forming the basis for the National Association for the Advancement of Colored People (NAACP).
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Answer:
They used different forms of agriculture, to make other tribes of Native Americans interested to barter with them.
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Answer:
The Philippine campaign showed Japan's aggressiveness and perseverance towards battles.
Explanation:
The Philippine campaign showed that the Japanese government, even at a disadvantage, would not so easily win the victory of its enemies of war. This is because the Japanese army has shown itself to be aggressive and persevering in its fight against American forces, even if defeat was almost guaranteed. This showed that Japanese soldiers saw the battlefield as something that represented their honor, for this reason, they would rather die fighting than surrender to the enemy army.