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National Guard troops typically are deployed for a variety of emergencies and natural disasters with the permission of governors in responding states. Trump, a Republican, sent about 1,000 California National Guard troops to Los Angeles despite the objections of California Gov. Gavin Newsom and Los Angeles Mayor Karen Bass, both Democrats.

Confrontations began when dozens of protesters gathered outside a federal detention center demanding the release of more than 40 people arrested by federal immigration authorities across Los Angeles as part of Trump's mass deportation campaign.

Trump said he had to federalize the troops to "address the lawlessness" in California. Newsom said Trump's order was a "complete overreaction" that was "purposely inflammatory and will only escalate tensions."

Some previous National Guard deployments restored peace after violent crackdowns from local law enforcement or vigilante violence, but sometimes troops intensified tensions in communities and with people who were protesting for civil rights or racial equality.

"The people's right to peacefully exercise their collective power and challenge this administration's unjust policies targeting Black and Brown communities must be protected," leaders of eight legacy civil rights groups, including the NAACP, the National Action Network and the Legal Defense Fund, said.

At the Movement for Black Lives, a coalition of racial justice organizations, Amara Enyia expressed concern that the federal troop deployment could result in disproportionate arrests and more severe charges for the Black protestors, as was true during protests in 2020 after the police murder of George Floyd, an unarmed Black man, in Minneapolis.

Military and police officers will have an "everything is a target" mentality, said Enyia, co-executive director of the coalition's programs, campaigns and policy work.

"It is a very frightening proposition, one that does not bode well for the rights of people in this country," she said.

On rare occasion, presidents invoked an 18th-century wartime law called the Insurrection Act, which is the main legal mechanism that a president can use to activate the military or National Guard during times of rebellion or unrest. Other times they relied on another federal law that allows the president to federalize National Guard troops under certain circumstances, which is what Trump did.

Still, some experts say the current standoff in Los Angeles is not comparable, from a legal perspective, to past situations.

"I think that the provision that Trump is using is really an exception to the norm," said Bernadette Meyler, a professor of constitutional law at Stanford University.

Here's a look at some notable past deployments:

2020: George Floyd protests

Almost five years ago, Newsom deployed about 8,000 National Guard troops to quell protests over racial injustice inspired by Floyd's killing in Minnesota. Well over half the troops deployed in California were sent to Los Angeles County, where police arrested more than 3,000 people. City officials, including then-Los Angeles Mayor Eric Garcetti, supported Newsom's decision.

Yale historian Elizabeth Hinton, who wrote a book about race-related uprisings and police violence, said the 2020 protests were characterized as violent but for the most part were not.

That's even truer today, she said.

"There is no imminent threat that would require the mass deployment of militarized troops," Hinton said.

1992: Rodney King protests

Some compared Trump's decision to George H.W. Bush's use of the Insurrection Act to respond to the 1992 uprising in Los Angeles after the acquittal of white police officers who were videotaped severely beating King, a Black motorist. In just six days, the protests became among the deadliest in American history. Sixty-three people died, nine of whom were killed by police.

Syreeta Danley, a teacher from South Central Los Angeles, said she vividly remembers as a teen seeing black smoke from her porch during the 1992 uprisings.

She said some people in her neighborhood were still more afraid of the police than the National Guard because once the troops left, city police "had the green light to continue brutalizing people."

The National Guard can enforce curfews like it did in 1992, but that won't stop people from showing up to protest, Danley said.

"I have lived long enough to know that people will push back, and I'm here for it," she said.

1965: Watts protests

There were deadly protests in the Watts neighborhood of Los Angeles in 1965 in response to pent-up anger over an abusive police force and lack of community resources. More than 30 people were killed, two-thirds of whom were shot by police or National Guard troops. Many say the neighborhood never fully recovered from fires that leveled hundreds of buildings.

Breeze McDonald, a doctoral student and school district employee from South Central Los Angeles, says she is still haunted by scars her aunt sustained after she was hosed down during the 1965 protests, and her own memories of the 1992 uprisings.

"A lot of the anger happened because our voices weren't being heard," McDonald said, "Because instead of stopping to listen, you decided to employ the National Guard."

1950 and 1960s: Integration protests

In 1956, the governor of Tennessee assigned National Guard troops to help enforce integration in Clinton, Tennessee, after white supremacists violently resisted federal orders to desegregate.

President Dwight Eisenhower called the Arkansas National Guard and the 101st Airborne Division of the U.S. Army in 1957 to escort nine Black students to integrate a white-only school.

In 1963, Maryland's Democratic Gov. J Millard Tawes deployed the Maryland National Guard to the small town of Cambridge to mediate violent clashes between white mobs and Black protesters demanding desegregation. The troops remained there for two years.

1965: Voting rights protest

National Guard troops played a pivotal role in the march often credited with pressuring the passage of the Voting Rights Act of 1965.

Nonviolent protesters calling for the right to vote — including the late Congressman John Lewis — were brutally assaulted by state troopers in Selma, Alabama.

Two weeks later, then-President Lyndon B. Johnson sent National Guard troops to escort thousands of protesters along the 50-mile march to the state Capitol. Johnson's decision was at odds with then-Gov. George Wallace, who staunchly supported segregation.