Final answer:
The statement that many body modifiers in the U.S. modify their bodies to belong to a specific group of people is true, as individuals often use body modification to identify with subcultures while still engaging with the larger society.
Step-by-step explanation:
Many body modifiers in the United States are indeed motivated by a desire to belong to a specific group of people. This statement is True. Body modification can be used as a form of self-expression but also as a means to identify with a particular subculture. These subcultures can be based on shared interests, such as biker culture, or shared experiences, such as those offered by support groups like Alcoholics Anonymous. While individuals in these subcultures may modify their bodies to align with the group's aesthetics, they also continue to participate in broader societal activities and identify with the larger community in which they live.