Ben Carson’s first full week as secretary of Housing and Urban Development got off to a rough start on Monday after he described African slaves as “immigrants” during his first speech to hundreds of assembled department employees. The remark, which came as part of a 40-minute address on the theme of America as “a land of dreams and opportunity,” was met with swift outrage online.

Mr. Carson turned his attention to slavery after describing photographs of poor immigrants displayed at the Ellis Island National Museum of Immigration. These new arrivals worked long hours, six or seven days a week, with little pay, he said. And before them, there were slaves.

“That’s what America is about, a land of dreams and opportunity,’’ he said. “There were other immigrants who came here in the bottom of slave ships, worked even longer, even harder for less. But they too had a dream that one day their sons, daughters, grandsons, granddaughters, great-grandsons, great-granddaughters, might pursue prosperity and happiness in this land.”