SANTIAGO, Chile — Amid the ghosts of Chile’s past and an escalating confrontation in Libya, President Barack Obama used the mid-point of his first extended Latin American tour to address the region, saying no other part of the world shared so many of the United States’ values and interests.

Speaking on the grounds of Chile’s presidential palace, Obama vowed to work with Latin America on improving security, boosting trade and bolstering education in a partnership of equals that would benefit the entire region.

“We are all Americans,” he said. “ Todos somos Americanos.”. . .