How do you say this in English (US)? Came across the following sentence in Wiki the other day. Is it grammatically correct?
"What happened to us as a people that this should happen to us?"
If it is, what is the syntactic function of "that" here?
If it isn't, how could it be corrected?

See a translation

@JayShiShei Scott was buried at Chapel Hill Memorial Gardens in Littleton on April 24, 1999, following a two-hour funeral service held at the Trinity Christian Center.[49] Her funeral was one of the first services following the massacre and was attended by more than 1,000 people that included friends and staff at Columbine High School. The Reverend Porter began the service by addressing the congregation with the question, "What has happened to us as a people that this should happen to us?" He then addressed the solemn crowd with a speech that included references to Scott's pious character, kind nature and love of her fellow human, before stating: "You have graduated early from this life to a far better one, where there is no sorrow, violence or death."[50] Her friends from the Orchard Road Christian Church Youth Group also sang a song at the service, composed in her honor, entitled "Why Did You Have to Leave?"[51]

@saliva It seems to me that it's an adverbial clause indicating a result of an event. To my understanding, The only situation where "that" functions like this is in the "so...that" expression. Can we use it by omitting “so”?

@JayShiShei Old - that's what I thought too! I guess I should avoid this style in formal writing.