What is “Mid-Century / Modern”?

Mid-century modern (MCM) is an American design movement in interior, product, graphic design, architecture, and urban development that was popular from roughly 1945 to 1969,[1][2] during the United States’s post–World War II period. The term was used descriptively as early as the mid-1950s and was defined as a design movement by Cara Greenberg in her 1984 book Mid-Century Modern: Furniture of the 1950s.