sentences:  It has been estimated that one third of Americans today can trace at least one ancestor’s entry into the United States through Ellis Island.In 2001, Save Ellis Island entered into an agreement with the National Park Service to coordinate fundraising activities and oversee the historic preservation of Ellis Island.Shuttered for 60 years, Ellis Island's South Side Hospital Complex was opened to visitors for the first time on October 1, 2014, revealing an overlooked story in immigration to the United States.