A

assembly line:

A factory innovation consisting of a waist-high, belt, along which parts move while workers (each performing one task over and over) gradually assemble the product.

B

Barnstormers:

Pilots from the early days of aviation, who performed daring feats (such as rolling their airplanes, flying upside down, and even walking on the wings) at county fairs and other exhibitions.

birth control:

The use of contraceptives, which are devices or methods to prevent pregnancy. During the Roaring Twenties, it was illegal in many states to disseminate birth control or even information about it, yet growing numbers of women were beginning to use it.

Black Thursday:

October 24, 1929, when orders to sell stocks rose at an alarming rate while prices fell, leading to hysteria and panic on the streets of New York City's financial district and elsewhere.

Black Tuesday:

October 29, 1929, when the stock market crashed...