Until this past weekend, it had been 60 years since a U.S. president federalized a state's National Guard force without the cooperation of its governor. President Lyndon B. Johnson invoked that authority in 1965, calling on troops to protect civil rights advocates who were marching from Selma, Ala., to Montgomery .

That incident is now in the spotlight again, after President Trump's controversial move to federalize the California National Guard — against the wishes of Gov. Gavin Newsom.

Trump says the military presence is needed to restore order, after Immigration and Customs Enforcement raids sparked public protests . Newsom says demonstrators who aren't peaceful should be punished — but he also blames Trump, saying the president has inflamed the situation.

In recent decades, sev

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