With the Act of Union in 1536 Henry VIII made Wales a part of England.
He did not see the need to reform the government of Wales at the beginning of his reign, but gradually he perceived a threat from some of the remaining marcher lords and therefore instructed his chief administrator, Thomas Cromwell, to seek a solution. His solution was the annexation or incorporation of Wales which, along with other significant changes at the same time, led to the creation of England as a modern sovereign state.
Th Acts of Union were done by passing a series of measures between 1536 and 154. These included:
An act for laws and justice to be ministered in Wales in like form as it is in this realm (27 Henry VIII c. 26) in 1536, and,
An act for certain ordinances in the king's dominion and principality of Wales (34 and 35 Henry VIII c. 26) in 1543.
The first of these acts was passed by the English parliament which had no representatives from Wales in it at all and its effect was to make Wales an integral part of the kingdom of England: Wales ... is and ever hath bene incorporated, annexed, united and subiecte to and under the imperialle Crown of the Realme as a verry membre ... of the same.