The impact of America's wars on industrial production has varied dramatically, depending on the particular war and the stage of industrial development.
Most economies are considered mixed because most have some portion of the means of production under government control. Most economic systems also have some element of the market or capitalism. ... The most vulnerable members of society benefit from a mixed economy because they are offered some social safety net.
Californias gold minings. when some dude discovered gold
Air brakes were an invention that improved railway safrty
