In the United States, age of consent laws regarding sexual activity are made at the state level. There are several federal statutes related to protecting minors from sexual predators, but laws regarding specific age requirements for sexual consent are left to individual states, territories, and the District of Columbia. Depending on the jurisdiction, legal age of consent ranges from 16 to 18 years old. In some places, civil and criminal laws within the same state conflict with each other.
While the general age of consent is now set between 16 and 18 in all U.S. states, the age of consent has widely varied across the country in the past. In 1880, the age of consent was set at 10 or 12 in most states, with the exception of Delaware where it was 7. The ages of consent were raised across the U.S. during the late 19th century and the early 20th century. By 1920 ages of consent generally rose to 16-18 and small adjustments to these laws occurred after 1920. As of 2015 the final state to raise its age of general consent was Hawaii, which changed it from 14 to 16 in 2001.
Age-of-consent laws were historically only applied when a female was younger than her male partner. By 2015 ages of consent were made gender-symmetric. Until the late 20th century many states had provisions requiring that the teenage girl must be of previous "chaste character" in order for the sexual conduct to be considered criminal. In 1998 Mississippi became the last state to remove this provision from its code.
The laws were designed to prosecute persons far older than the victims rather than teenagers close in age; therefore prosecutors rarely pursued teenagers in relationships with other teenagers even though the wordings of the laws made some close-in-age teenage relationships illegal. After the 1995 Landry and Forrest study concluded that men aged 20 and older produced half of the teenage pregnancies of girls between 15 and 17, states began to more stringently enforce age-of-consent laws to combat teenage pregnancy in addition to prevent adults from taking advantage of minors. A backlash among the public occurred when some teenagers engaging in close-in-age relationships received punishments perceived by the public to be disproportionate, and thus age-gap provisions were installed to eliminate penalties if the two parties are close in age, and other measures were introduced that reduced penalties if the two parties were close in age. Brittany Logino Smith and Glen A. Kercher of the Criminal Justice Center of Sam Houston State University wrote that these laws are often referred to as "Romeo and Juliet laws", though they defined Romeo and Juliet as only referring to an affirmative defense against prosecution. Previously some of these statutes only applied to heterosexual sex, leaving homosexual sex in the same age range open to prosecution.