Immigrants looking for a path to citizenship often have a wide range of different reasons to gain those credentials. Some want to be able to have the legal right to work in the United States, while others want to start up their own business and contribute to the economy. A lot of immigrants wish to have the right to vote for representatives that share their beliefs and values, but there are other, lesser-known, benefits to gaining US citizenship.
People with citizenship are able to petition for their children (including married adult children), siblings and parents to be allowed to come and live in the United States, while lawful immigrants who have been granted the status of Permanent Resident are only allowed to petition for underage children, spouses and adult offspring that are unmarried. The waiting time for family member petitions is currently so long that many people just do not bother applying.
Immigrant children below the age of 18 who are protected via Lawful Permanent Resident status are granted US citizenship automatically once their parents have become naturalized. There is also the chance for dual citizenship.
A number of countries offer dual citizenship, which means that immigrants that are wary of gaining US naturalization out of fear of losing residency in their country of origin can swear allegiance to the US without necessarily losing citizenship in their own country. Naturalization in the United States means citizens are entitled to access Medicare as well as some other public health care programs and benefits.