Answer:
The United States mainly, but also some countries of Europe (such as France and England)
Step-by-step explanation:
1870 is the year when we start seeing what is now called The American Industrial Revolution. This was a sudden growth in technological advancements that happened during the late 19th century and it was pushed forward by an expressive economic growth. In Europe, by 1870, there were telegraphs and railroads which allowed faster communication and delivery of products as well.