How Ireland Scotland wales came united with England in 1750?

This is incorrect. Ireland, Scotland, and Wales did not come united with England in 1750. Wales was already part of England, having been conquered and incorporated into the English kingdom in the 13th century. Scotland was united with England in 1707 through the Acts of Union, which created the Kingdom of Great Britain. Ireland was not united with Great Britain until 1801, through the Act of Union.