The man who sold the Eiffel tower twice was a con artist named Victor Lustig.
For resources and to prove that they were powerful. Their initial holdings before WW2 were not enough to fuel the war machine it wanted to become.
1. Math
2. Science
3. Literature
4. Philosophy
To phrase this in a sentence, you could say that the Ancient Greeks made important contributions to future civilization by their contributions to math, science, literature and philosophy.