In this Sept. 8, 2018 photo, Alma Morales Rosario poses for a portrait between the beams of her home being rebuilt after it was destroyed by Hurricane Maria one year ago in the San Lorenzo neighborhood of Morovis, Puerto Rico. Rosario, who is incapacitated by diabetes and a blood disease, took a loan to upgrade her home before the storm hit, and lost everything. After the storm, Rosario rented a home until she could no longer afford it on her monthly 598 dollar pension and now splits her time living with her mother and daughter. Rosario said she already spent her 7,000 dollars of FEMA aid, and is now using money from a relative, who is also helping her with the labor of rebuilding her home, but says she knows there's not enough money for all the materials. "I hope with God's help to have the house closed on the outside, walls and ceiling in November. But if it's not possible, I'll make a room with the wood I have under the structure and live there until I can finish it. I never thought this was going to happen to me," she said. (AP Photo/Ramon Espinosa)
In this Sept. 8, 2018 photo, Alma Morales Rosario poses for a portrait between the beams of her home being rebuilt after it was destroyed by Hurricane Maria one year ago in the San Lorenzo neighborhood of Morovis, Puerto Rico. Rosario, who is incapacitated by diabetes and a blood disease, took a loan to upgrade her home before the storm hit, and lost everything. After the storm, Rosario rented a home until she could no longer afford it on her monthly 598 dollar pension and now splits her time living with her mother and daughter. Rosario said she already spent her 7,000 dollars of FEMA aid, and is now using money from a relative, who is also helping her with the labor of rebuilding her home, but says she knows there's not enough money for all the materials. "I hope with God's help to have the house closed on the outside, walls and ceiling in November. But if it's not possible, I'll make a room with the wood I have under the structure and live there until I can finish it. I never thought this was going to happen to me," she said. (AP Photo/Ramon Espinosa) Credit: Ramon Espinosa

Clapping and raising their hands to the sky, hundreds of people clad in white gathered at an 18th-century fort in the Puerto Rican capital on Thursday to remember the thousands who died in the aftermath of Hurricane Maria as the U.S. territory struggles to recover one year after the Category 4 storm hit.

Religious leaders and government officials recalled how Puerto Rico was ravaged by the storm that killed an estimated 2,975 people and caused more than an estimated $100 billion in damage.

Tens of thousands remain without adequate shelter or reliable electrical power, a sad fact that Gov. Ricardo Rossello noted on Thursday.

“After that catastrophic experience, we acknowledge how complex and difficult it is to prepare for a hurricane of that magnitude and fury,” Rosello said. “The best tribute we can give these people, these brothers that we’ve lost, is to build a better Puerto Rico for their sons, their grandsons and their families.”

While the U.S. government has invested billions of dollars to help clean up and repair the U.S. territory, much work remains. Major power outages are still being reported, tens of thousands of insurance claims are still pending and nearly 60,000 homes still have temporary roofs unable to withstand a Category 1 hurricane.

“I think it’s inexplicable,” Kumi Naidoo, Amnesty International’s secretary general, told the Associated Press during a visit to the island Thursday. “There’s no justifiable reason I can see for this gross level of negligence.”

Across the island, people marked the one-year anniversary with gatherings large and small, solemn and anger-tinged – and at times, even hopeful.

In the coastal fishing and farming village of Yabucoa, the strains of one of Puerto Rico’s most beloved songs filled the air at 6:15 a.m., the exact moment the storm made landfall there one year ago.

Tarps still covered many homes that have yet to be rebuilt in the town of 37,000, even as the nostalgic strains of “Amanecer Borincano” — “Puerto Rican Dawn” — resonated at the spot where Maria first unleashed its fury.

“I am the light of the morning that illuminates new paths,” a choir sang as dozens of local officials and residents gathered there. “I am the son of palm trees, of fields and rivers.”

In San Juan, the crowd of worshippers gathered at the 230-year-old San Cristobal fort sang and prayed along with pastors and musicians on stage, with music echoing through the fort’s heavy walls as the sun slowly sank into the sea behind them.

Pastor Elder Gonzalez said he and other volunteers who flew to Puerto Rico after the hurricane to help were shocked at what he saw from up high.

“To see the island of enchantment was a deep and painful experience,” he said. “No one on the plane said a word.”

Government officials argue that many changes have been made to better prepare Puerto Rico for future storms, but they acknowledge that significant obstacles remain.

Jose Ortiz, director of Puerto Rico’s Electric Power Authority, told reporters that 20 percent of repairs made to the power grid need to be redone. He said crews didn’t have access to the best materials at the time or were forced to rely on temporary fixes, such as using trees as makeshift power polls after Maria destroyed up to 75 percent of transmission lines.

In addition, municipal officials have complained that reconstruction efforts are too slow. Ariel Soto, assistant to the mayor of the mountain town of Morovis, said that 220 families there remain without a proper roof.

“We’re still waiting for help,” he said. “This hit us hard.”