Washington, D.C. Street gangs have existed in the United States since the 1800s. But in the last few years, street gangs have grown more violent, more numerous and more widespread, from the big cities to rural areas. Many gang members are illegal immigrants, mostly from Latin America. An adolescent may hunger for a sense of power. Especially if that youngster has few things in life: no money, little education, a broken family and no cultural attachments to his community. Analysts say teenagers may find power and fear through a street gang, and that is why gangs are growing so rapidly...