Which presidents were Republicans?

There have been 18 Republicans Presidents. They include Abraham Lincoln, Ulysses S. Grant, Rutherford B. Hayes, James A. Garfield, Chester A. Arthur, Benjamin Harrison, William McKinley, Theodore Roosevelt, William Howard Taft, Warren G. Harding, Calvin Coolidge, Herbert Hoover, Dwight D. Eisenhower, Richard Nixon, Gerald Ford, Ronald Reagan, George H.W. Bush, and George W. Bush.