Step 1: Get a decent amount of oil.
Step 2: Sell all your oil to a weak country
Step 3: Go to Cuba, then go to Wal-Mart, then buy a lot of AK-47s.
Step 4: Go fight the weak country, and get your oil back and take over the country
Step 5: Steal all of that country's oil and take over it's Armed Forces.
Step 6: Repeat.