3. Today, how many Americans can trace their roots to ancestors who came through Ellis Island?

40 percent

From 1892 until the center's closing in 1954, the small island in New York harbor served as the official entry and processing point for over 12 million immigrants. It has been estimated that over 40 percent of Americans can trace their ancestry through Ellis Island

Hope this helps!! <3

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

id say bottom left to top top left to bottom right and middle to middle

explanation: