The march of U.S industrialization (1 ene 1870 año – 1 ene 1900 año)
Descripción:
 The march of U.S industrialization did not go entirely unopposed: large-scale labor unions emerged alongside big business in the period of 1870-1900, and confrontations between business owners seeking profits and workers seeking higher wages or job security sometimes grew ugly. A nationwide, coordinated strike of rail workers in 1877 shut down two-thirds of the nation's railroads 
Añadido al timeline:
fecha:
1 ene 1870 año
1 ene 1900 año
 ~ 30 years