The tiny invaders being discussed in the article are plants. They are considered invaders because they came from other countries, but are now threatening the native plants. People brought them in because they wanted to make their gardens and yards beautiful because the plants are very rarely found locally.
Well, the problem is there wasn't just one ruler. there were many pharaohs that ruled ancient egypt throughout history. if you're talking about during a certain time period, maybe add that?
The event would be the attack on Pearl Harbor, which occurred on December 7th, 1941. Hope this helped!
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