The correct answer is 4) when Germany attacked Russia and Austria-Hungary invaded France.
The first major battles of World War 1 occurred when Germany attacked Russia and Austria-Hungary invaded France. We are talking about the Battle of Tannenberg of August 26-30, 1914, at the very beginning of World War 1. It was held in East Prussia, modern-day Poland. The German troops attacked and defeated the Russian Army. The second major battle was the Battle of the Marne from September 6 to 14, 1914, held at Marne River in the East of Paris, France.
Industrialization emerged in the United States almost immediately after it emerged in Great Britain after in the Industrial Revolution in the late 18th century and into the 19th century.
