Here is a few I found.
Mining
Hydropower
Petroleum
Gaius Julius Caesar was a Roman general and statesman who played ... After assuming control of government, Caesar began a program of social and ... the Republic and was eventually proclaimed "dictator for life" (Latin: dictator perpetuo ).
Some countries didn't have stuff that other countries had, so they used to trade to grow their community and for their people to survive. Trading was important to have all their goods they wanted.
