Youngsters will learn words they will not understand.

Children from India will ask: What is hunger?
Children from Alabama will ask: What is racial discrimination?
Children from Hiroshima will ask: What is the atomic bomb?
Children at school will ask: What is war?

You will answer them.
You will tell them:

Those words are not used any more,
Like stage-coaches, galleys or slavery-

Words no longer meaningful.

That's why they have been removed from dictionaries.