The United States is pledging an initial $115 million in aid to Haiti.
President Barack Obama has asked former presidents George W. Bush and Bill Clinton to help his administration with relief efforts.
"This is one of those moments that calls out for American leadership," Obama said Thursday. "For the sake of our citizens who are in Haiti, for the sake of the Haitian people who have suffered so much, and for the sake of our common humanity, we stand in solidarity with our neighbors to the south, knowing that but for the grace of God there we go."
"We have no higher priority than the safety of American citizens, and we've air-lifted injured Americans out of Haiti," he added. "We're running additional evacuations and will continue to do so in the days ahead."
"To the people of Haiti, we say clearly and with conviction, you will not be forsaken," the president continued. "You will not be forgotten. In this, your hour of greatest need, America stands with you. The world stands with you."
All around the world, many nations are responding to the humanitarian crisis.
A flight from China landed in Haiti on Friday with search and rescue workers, medical teams and tons of food. France sent three planes with supplies and a mobile hospital. The United Kingdom is sending detection dogs along with its rescue workers. Germany, Venezuela and Cuba have also pledged financial support.