<p>Harriet Beecher Stowe was renowned not only in the United States but also in Europe: in Rome she could seldom walk through the streets unrecognized. </p>
<p>^^I thought you were only allowed to use the colon when listing things. For example,</p>
<p>"I bought the materials I needed at the store: A pencil, notebook, and a eraser."</p>
<p>I think this is a good way to see it:
Semi colon connects 2 independent clauses that are related.
Colon connects 2 independent clauses when the 2nd is a RESULT of the first. Because she was renowned in Europe, she couldn’t walk the streets unrecognized. A semi-colon would also work there, I think, but I guess a colon is just a bit better. Obviously, a colon is also used for lists (which can be thought of as a result of the former clause).
A dash is either for emphasis or for an interjection of sorts.</p>
<p>I have seen colons come up a couple times, and they usually come up with semi-colons as other possible answer choices. However, usually the difference between the choices will not ONLY be the colon and the semi-colon. Thus, you can just use other clues to find the right answer instead of having to pick between a colon and semi-colon.</p>