Colonial families had different structures depending on whether they lived on farms or in cities. On farms, extended families worked together and everyone had responsibilities. In cities, it was easier to live alone as a single person in a boarding house or as a servant. Men had authority over the household and women were expected to marry for economic and religious reasons rather than love, taking on domestic duties. Children also had household responsibilities from a young age. Colonial society was stratified, with social class determined mainly by land ownership. The upper class included wealthy landowners while the middle class comprised farmers and artisans. Indentured servants contracted their labor temporarily in exchange for passage to America.