It was the first multicultural empire in history. It was also the first very large empire. Because of this the Empire had to develop ways of running effectively. Roads were built over great distances. Standardize currency. Localized governing systems (i.e. satrapies). It was also the first time Asian powers attempted to invade Europe.
It was yet another tax. this one taxing stamps for mailing. but it was a fairly small tax until it hit the big businesses who bought bulk and the tax hurt.
Take safety, get food and water and other supplies you need. Make sure everyone around you are safe and yourself.