In American colonial history, settees date back to 1770. They were distinct because they were built with one scrolled arm and square legs.
Loveseats in the 1800s took shape with an additional arm. The woodwork along the base also became more stylish and intricate.
Thomas Chippendale was an English cabinet maker during the 1700s and designed furniture reflecting Chinese, English and Gothic themes. Many antique loveseats throughout the last 200 years reflect his style.
The boudoir loveseat commonly had a skirt covering the base and its backs were designed like chairs. These loveseats can be seen in 1940s furniture advertisements.
In the late 20th century, loveseats transitioned from the antique look to functionality. They were designed to double as sleepers, for example, and continue to be manufactured to fit modern trends.