7.6k views
3 votes
Which was a cause of world war 1

,the invention of an ariplane,
russias race to industrialize,
the second industrial revolution,
europes system of millitary alliences

2 Answers

3 votes
i guess its the last one 
User KJF
by
6.7k points
2 votes
Europe's System of Military Alliances
User Nether
by
6.0k points