Some historians write that World War I (the Great War) was avoidable. What institutions and ideas developed after 1919 to prevent a recurrence? Why did they fail by 1939?

What was the biggest difference between government in ancient athens and in ancient rome? rome was a direct democracy, and athens was not. athens allowed all citizens to vote, while rome was a republic. athens allowed women and slaves to vote, but rome did not. rome had a bicameral assembly, and athens did not.