Which sentence states a fact?
A: The United States Civil War began in 1861.
B: The United States Civil War was the saddest war.
The first sentence states a fact.
The United States Civil War began in 1861.
It can be proved by looking up the year that the United States Civil War started.
The second sentence states an opinion.
The United States Civil War was the saddest war.
Saddest shows what a person believes, thinks, or feels. Another person might have a different opinion about what makes a war sad.