Until the early 20th century, high schools were typically attended only by the children of middle- and upper-class families.
Certain forms of physical education — like a wall-climbing apparatus from the late 1890s — are unrecognizable today.
Students rode horse-drawn coaches to get to school in the late 19th and early 20th centuries.
The early 1900s saw a dramatic increase in the number of high schools built and student enrollment.
By the 1930s, motorized school buses had become common.
Photos of gym classes from the 1930s show unfamiliar exercise equipment, including what looks like a human-sized hamster wheel.
In 1940, for the first time in US history, about half of all students finished high school.
Photos of high schools during the mid-20th century show students listening to radio broadcasts during class.
Students also were taught using televisions.
In 1954, the United States Supreme Court ruled unanimously that segregation in public schools is unconstitutional.
Throughout the latter half of the 20th century, civil-rights activists continued to combat racial inequalities in education and beyond.
In the 1980s, more schools began to introduce computers into classrooms.
In the '90s, educators and software companies created new ways for students to learn using computers.
By the end of the 20th century, the use of laptops in the classroom was commonplace.