The Persian ruler Darius l promoted the religion Zoroastrianism.
The main cause of World War I was actually a wrong turn. The assassination of Archduke Franz Ferdinand in Sarajevo on 28th June 1914, it triggered a chain of events that resulted in World War 1.
There were many economy reasons for expanding. When you have more land you profit more. There would also more opportunity with more land.
That is a good question.The answer to that is limitless as well. We had one main goal though when we started our nation. That was to create a nation that was not like England. Recently there was the election for our president. We have our elections so that we the people have a vote in what is going on with our nation where as when there was a king we had no choice.