20
Lesson 20 of 84 · Rules and Safety
Golden Rule: Treat Others as You Want to Be Treated
World War I (1914–1918) was one of the deadliest conflicts of its time. New weapons — machine guns, tanks, and poison gas — caused devastating casualties across Europe.
Key Facts
1
Communities work together.
2
Everyone is important.
3
We can make good choices.
Check Your Understanding
Question 1
1 of 2What can you do to help others?