Final answer:
The 2010 US Census reported that 12.4% of all residents were foreign born.
Step-by-step explanation:
The subject of this question is Social Studies. The question asks about the percentage of foreign-born residents in the 2010 US Census.
According to the information provided, in the 2010 US Census, 37,342,870 people, or 12.4% of all residents, were foreign born. This means that approximately 12.4 out of every 100 residents were born in a different country.
This information is important for understanding immigration patterns and the diversity of the United States population, which are key topics in the field of Social Studies.