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:
D) Slavery was outlawed in all states and U.S. territories.
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The answer is: no, because they were not democratic
The soviet union was notoriously known for adopting an authoritarian state as its form of government.
They put total control on the media, preventing anyone from voicing negative opinion about the government. They also utilize their military to execute activists who threaten government reputation. such actions heavily contradict the democratic value that held by members of European union.
The british army was becoming increasingly nervous about the american abilities.