Answer:
Today, there are planes, automobiles, subways, etc. Technology and science has had the biggest influence on transportation. Engineers and physicists have made it possible to take 150 people and fly them across the ocean. Automobile designers continue to find greener ways to build cars that will emit less pollution.
Explanation:
The event that marked the end of the Roman Republic is often attributed to the defeat of Marc Antony in 31 BC at the Battle of Actium which ended the period of civil war.
Almost all humans to a certain extent are dissatisfied with the limited availability of resources, but if you're speaking from an academic point of view, it would be Economists, since they study choices made from this limited availability.
The answer is gunpowder and square sails