More than 30 bomb threats have been made against schools, government buildings and city officials’ homes since last week, forcing evacuations and closures.

Last week’s presidential debate thrust Springfield, Ohio, into the national spotlight, prompting people to wonder how a Haitian community has taken root there — and why. Here’s a look at some key questions,

Republicans in places like Springfield, Ohio, and Charleroi, Pa., say Haitian immigrants have provided a boost.