I think your best shot is probably choice A
Explanation:
Nonfiction books are grouped together by subject to make it easier to find a book related to a specific topic. The system that most libraries use to organize books was invented by Melvil Dewey and it is called the Dewey Decimal System. Each book is assigned a three-digit call number based on what the book is about.
Answer:
Spread of communism (The Domino Theory) and its support from China and Russia.
Explanation:
Before the Vietnam war, the United States was very much concern about the spread of Communism in Asia, as they gave it a term of Domino theory. The theory asserted the situation of letting a communist nation to takeovers other neighbouring states and converting it under communism. The U.S. involvement in Vietnam began in 1954, though ongoing conflict in the region of North and South.
Russia assisted China in spreading communism in Asia which also became one of the reasons for the United States to refuse to withdraw from the Vietnam conflict.
I'm 99% sure it's D. Not C cause not all were presidents. Not B because only George Washington out of the 4 wrote the Independence. Possibly A. but more likely D
A is the right answer, they did this bc they needed to access all of their islands
