Indentured servants would work 4-7 years for colonists in America in exchange for (EC):

Usually in exhange for a paid passage to America

Explanation:

Because many indentured servants were poor, they couldn't afford passage into America, and they usually wanted to live there to obtain a better life. They were given some shelter/housing, feed, and paid for their work. However, most died before their contracted ended because of poor working conditions.

napoleon the third became a empire in 1873 also known as the era of the franco-prussian war.