Which sentence states a fact?
The First World War was waged for no good reason. The First World War began in 1914 and ended in 1918.
A fact is something that can be proved to be true. Facts can be proved by observing, measuring, or studying information.
The flag of the United States has 13 stripes.
This is a fact. It can be proved by looking at the flag and counting the number of stripes.
An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true.
The flag of the United States is easy to draw.
This is an opinion. People may have different opinions about what makes a flag "easy" to draw.
The first sentence states a fact.
The First World War began in 1914 and ended in 1918.
It can be proved by reading a book about the First World War.
The second sentence states an opinion.
The First World War was waged for no good reason.
Good shows what a person believes, thinks, or feels. Another person might have a different opinion about whether or not reasons are good.