Which actions on the part of germany and italy created conflict and led to requests for the league of nations to intervene?

Creating large armies, creating armies and navies, creating new weapons, and threatening to or invading other countries.

The million arrivals of immigrants in the early 20th century spur economic growth because low skilled labor was needed for the manufacturing industries and was not available locally, and highly skilled arrivals were source of innovations and inventions.there was however a major political back lash against the immigrants which led to the emergence of nativists.