Also the US has offered tons of aid, its simply an issue of internal distribution due to transportation and logistical difficulties:
New York Times: Aid Is Getting to Puerto Rico. Distributing It Remains a Challenge
Governor Rosselló said a major issue was getting transportation to distribute aid to people who need it. He said the government was offering more trucks to the mayors and to the centers where hot food could be prepared and delivered.
“We have delivered food and water, and it hasn’t gotten to some people,” he said. “They didn’t listen, couldn’t hear, the information didn’t get to them.” He added: “I recognize there are still people that might not have gotten those resources.”
Some disaster experts say that while the military can be useful, it is not a cure-all in relief efforts, and that too many troops could overwhelm available resources in Puerto Rico. Others note the demands of addressing three major hurricanes in a row. The Trump administration has put an Army general in charge of recovery efforts and several thousand additional troops will soon be sent to the island.
In a conference call with reporters on Tuesday, government officials said they were making progress in aid efforts.
FEMA officials said they did not encounter the same issues distributing supplies to residents after the hurricanes in Texas and in Florida because, despite the damage, most roads into those areas remained intact. Once the floodwaters receded they were able to deliver aid.
In the mountains, the scale of natural devastation continues to hamper delivery efforts. In Las Marías, the storm clogged so many roads and toppled so many trees that it took volunteers and work crews about a week of sawing through fallen tree trunks and bulldozing mudslides to clear a path, local officials said. But keeping those supply lines open is a Sisyphean task.
“When it rains for 10, 15 minutes, everything we’ve cleared slides and we have to clear it again,” said Wilver Morales, 43, who works for the municipal government. “And every day, it rains.”
This Newsweek article is trying to make it sounds like FEMA isn't bringing aid to Puerto Rico.