Once there, they repaired and replaced roofs, windows and doors, in addition to sanitizing and removing mold from homes.
Even before the Category-4 storm hit, Puerto Rico was financially bankrupt with $120 billion in debt and pension liabilities it can not pay.
Nivia Rodriguez, a 60-year-old retiree whose uncle died a week after Maria, is among those disgruntled by Trump's comments, as well as by videos of rescue crews responding to Hurricane Florence in North Carolina.
Trump in a second tweet accused Democrats of inflating the death toll "in order to make me look as bad as possible when I was successfully raising billions of dollars to help rebuild Puerto Rico".
Kumi Naidoo, Amnesty International's secretary general, was also in Puerto Rico.
Rosselló, who has been reluctant to contradict the President in the past over his handling of the hurricane, previously disputed Trump's statement on the revised death toll, telling CBS News, "Neither the people of Puerto Rico nor the victims deserve their pain to be questioned".
According to the Puerto Rican government, the updated death toll is just shy of 3,000, making it one of the deadliest storms in USA history.
Puerto Ricans are USA citizens, but since the island is a U.S. territory they can not vote in national elections, and are represented in Congress only by a non-voting representative.
The Category 1 hurricane struck the island on September 20, 2017 with a force strong enough to wipe out its electrical power grid for months.
Calderon said Thursday that the current problems on the island are largely a "man-made crisis thanks to what's happened here in Washington, D.C." and the government's response. They also said LGBTI Puerto Ricans faced discrimination at emergency shelters across the island.
There are still some 45,000 homes with so-called "blue roofs", or tarps installed by the Federal Emergency Management Agency (FEMA).
"He simply is unable to grasp the human suffering that his neglect and lack of sensibility have caused us", said Cruz. The suit claimed that Puerto Ricans are owed $2.6 billion in unpaid damages. The San Juan mayor has noted that the island has seen only a fraction of nearly $50 billion in recovery funds Congress approved for Puerto Rico, including $20 billion in HUD funds.
Earlier Thursday, the White House sent a fact sheet to reporters touting the administration's "historic recovery effort" and "significant progress" over the year since Maria's landfall.
"Seeing where I grew up not looking the same and thinking if everyone was okay when I couldn't know if they were or they weren't", Hernandez said.
"The community, diaspora, and local non-government entities are making the difference by working hard to provide the necessary services to those devastated by the hurricanes", he told the Blade.