A single bullet killed conservative activist Charlie Kirk on Wednesday and pierced the collective conscience of Americans amid an ongoing era of political violence.

"It makes you wonder what is going on in our country. That this kind of violence is so prevalent," said Sen. Susan Collins (R-ME).

"We just cannot be a country that turns to violence when we disagree with people," said Sen. Elizabeth Warren (D-MA).

But more and more, that's been the case in the United States.

Last year, two assassination attempts targeted then-candidate President Trump.

In April, Pennsylvania's Democratic Governor Josh Shapiro's house was set on fire during the Jewish holiday of Passover.

In June, a gunman assassinated Democratic Minnesota state Representative Melissa Hortman and her husband, and shot and

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