Historians, civil rights organizations and lawmakers are denouncing the Museum of the American Revolution for hosting an upcoming event with Moms for Liberty, a controversial campaign organization that has been called an extremist group by critics. Moms for Liberty (M4L), which the anti-hate watchdog Southern Poverty Law Center labeled as an extremist, anti-government group, will hold a summit in Philadelphia this weekend featuring several Republican presidential candidates, including Donald Trump, Ron DeSantis and Nikki Haley. In a decision that has generated widespread backlash, the Museum of the American Revolution has agreed to host a welcome event for the organization on...