The statement "In 2007 an estimated 12 million undocumented immigrants were living in the United States" is **True**.
Here's why:
1. In 2007, various reports and studies estimated that there were around 12 million undocumented immigrants residing in the United States. This number has been widely cited in discussions and debates surrounding immigration policies and reform.
2. The issue of undocumented immigrants in the U.S. has been a significant topic of discussion due to its impact on various aspects of society, including economics, social services, and politics.
3. The estimated number of undocumented immigrants in the country can fluctuate over time due to various factors such as changes in immigration policies, economic conditions, and enforcement efforts.
Overall, the statement is true based on the estimates and data available regarding the population of undocumented immigrants in the United States in 2007.
