If you just used one fact from a website or even in your own words, it might cause plagiarism because it sounds exactly like something from a website
To avoid plagiarism with facts, putting it into your own words, or something that make sense to you, without using the same/similar words from the website .
The repetition of the word "neutral" throughout the things on how we entered the World War I emphasizes the position of the United States in its attempt to be in the middle from the war.