The Act of Union, 1707
By the Act of Union, the Scots lost their Parliament but gained the freedom of the British Empire.
The Union of the Two Kingdoms was a work, of which many had quite despaired, in which number I was one; and those who entertained better hopes, thought it must have run out into a long negotiation for several years: but beyond all men's expectation, it was begun and finished within the compass of one.