Who was the 16th president of the United States?

Abraham Lincoln was the 16th president of the United States, serving from March 1861 until his assassination in April 1865. Lincoln is best known for leading the country during the Civil War and for his efforts in the abolition of slavery, particularly through the Emancipation Proclamation and the passage of the Thirteenth Amendment. His leadership during a pivotal time in American history, along with his powerful speeches and writings, has solidified his legacy as one of the greatest presidents in the nation's history.

The other individuals mentioned, while significant historical figures, do not hold the title of 16th president. George Washington was the first president, Franklin D. Roosevelt served as the 32nd, and Theodore Roosevelt was the 26th. Each of their presidencies brought unique contributions and leadership styles, but they are not associated with the designation of the 16th presidency.