Britain's daily life during the 18th and early 19th-century were most immediately affected by the Industrial Revolution. This revolution began during the 18th (specifically the late 1700s) century, and as time went by, this later reached to other places in the world.
The correct answer is "the Industrial Revolution". The Industrial Revolution was a period characterized by the implementation of new technologies in the manufacturing processes of industries in US and Europe from 1760 to 1820 or 1840 in some cases. Britain was one of the countries where the Industrial Revolution took place and had the greatest impact in daily life of citizens in late 18th century and early 19th century.