Ulster Scots have a long and distinguished history in the development of America. If you are interested in finding out more have a look at this link

http://www.ulsterancestry.com/ulster-scots.html

Presidents of Scots-Irish descent were Andrew Jackson, James Knox Polk, James Buchanan, Andrew Johnson, Ulysses Simpson Grant, Chester Alan Arthur, Grover Cleveland, Benjamin Harrison, William McKinley, Theodore Roosevelt, and Woodrow Wilson.
President McKinlay said of the Scots-Irish "They were the first to proclaim for freedom in these United States; even before Lexington the Scotch Irish blood had been shed for American freedom." He was referring to a fight at Alamance River in North Carolina on May 14th, 1771, between a British force and the local Scots-Irish inhabitants.
George Washington said: "If defeated everywhere else. I will make my last stand for liberty among the Scotch Irish of my native Virginia." He obviously held them in high regard. Reading the above link will give you a good idea why.