Angry and frustrated Americans joined rallies and marches across the U.S. Saturday to advocate for gun reform in the wake of the back-to-back mass shootings in Uvalde, Texas, and Buffalo, New York.

The nationwide event was organized by March For Our Lives, a group founded by student survivors of the 2018 high school shooting in Parkland, Florida, that killed 17 people.

The marches are in response to the May 24 shooting at a Uvalde elementary school that killed 19 students and two teachers, as well as the May 14 massacre at a Buffalo grocery store where 10 people, all of whom were Black, were gunned down in an alleged hate crime.

Gen Z 'done' with 'thoughts and prayers'

Santiago Mayer, executive director of Voters of Tomorrow, shed light on Generation Z's perspective at the Los Angeles rally.

"We have grown up in a world where we all jump when a balloon pops. In a world where we have to scan every single exit and the movements of our classmates at school," he said.

"We don't live like this because we like it … we live like this because every single day the people in power make the conscious decision to put the NRA's money over our lives," Mayer said. "It's incredibly frustrating to keep talking about this, because every time that we try and do something, the other side just throws their hands up in the air and gives us 'thoughts and prayers.'"

Meyer said that "Generation Z is done with the games, done with the 'thoughts and prayers.'"

"We must take action now," he said. "We must ban assault rifles and high-capacity magazines. We must invest in school counselors and social services. We must raise the minimum age to buy a gun to 21."

Lawmakers, he said, "can vote for common sense gun legislation, or young people will vote them out."

Jun 11, 4:17 PM

'No one should be able to inflict these types of injuries'

At the March For Our Lives rally in Los Angeles, one woman held a sign reading: "Send the guns to Ukraine."

Dr. Jeffrey Birnbaum, a pediatric emergency medicine doctor in LA and a Parkland, Florida, native, explained the severity of semi-automatic rifle injuries.

He recalled his first experience treating patients shot by semi-automatic rifles, saying "the images of their injuries will be forever burned into my mind."

"I vividly remember thinking that no one should be able to inflict these types of injuries on a fellow human being," Birnbaum told the crowd.

A survivor of the 2014 mass shooting at the University of California Santa Barbara also shared her experience at the LA rally. She said after the shooting, her mother begged her to drop out of college, terrified for her safety.

Last month's Uvalde, Texas, shooting came one day after the anniversary of the UCSB massacre. She said she doesn't want any other generation to endure this grief.

"I know that we are exhausted -- but we must continue showing up … because I can't take it anymore," she said.

Jun 11, 3:01 PM