One of the most significant challenges is building an airplane had to do with "propulsion", since the technology that allowed motors to have enough energy to lift an airplane into the sky with a passenger wasn't available for most of history.
The Iran hostage crises are one of the most tangible events that greatly affects the diplomatic relationship between the countries of the United States and the Islamic Republic of Iran. The crisis took place when a group of Iranian students hostage an American embassy in Tehran wherein its hostages were released a year later.
Phillipson states the Twelve Tables were, “A set of statutes known as the Twelve Tables that was passed by an early assembly served as the foundation of the Roman private law.
A. Building a network of roads.
