President Obama is the 44th President of the United States. However, President Grover Cleveland served two non-consecutive terms. He was both the 22nd and the 24th President. So there have only been 43 different men who have been President.
US Presidents in chronological order from first to current:
Washington, Adams, Jefferson, Madison, Monroe, Quincy Adams, Jackson, Van Buren, W. Harrison, Tyler, Polk, Taylor, Fillmore, Pierce, Buchanan, Lincoln, Johnson, Grant, Hayes, Garfield, Arthur, Cleveland, B. Harrison, Cleveland, McKinley, T. Roosevelt, Taft, Wilson, Harding, Coolidge, Hoover, F. Roosevelt, Truman, Eisenhower, Kennedy, Johnson, Nixon, Ford, Carter, Reagan, G.H.W. Bush, Clinton, G.W. Bush, Barack Obama.
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To date, there have been 43 Presidents of the United States. Barack Obama is named the 44th President however, because Grover Cleveland had 2 nonconsecutive terms and was both the 22nd and the 24th President of the United States.
Two
There hasn't been any presidents from Rhode Island, yet.
If you are referring to what US Presidents were born in Italy, then your answer is simple; a US President could not have been born in Italy. If a person was born in a country or region not in American control, then they cannot become a President, since in order to be President, you must be born in a US held area. If you are referring to how many Presidents have Italian heritage in their blood, I believe that the answer is zero. No US President as of right now has had any noticeable Italian lineage.
The first five presidents established many of the protocols and precedents practiced today. Without them, many of these practices would have been quite different.
There are several. Check the link for related questions