The correct answer to this open question is the following.
One goal of U.S involvement in the war in Afghanistan was to eliminate the terrorist cell led by Osama bin Laden, after this cell made itself responsible for the terrorist attacks of September 11, 2001.
One challenge of U.S involvement in the war in Afghanistan was that the Afghans knew their territory very well. That is why President Bush ordered an air raid over Afghanistan, with the support of Great Britain.
One goal of U.S involvement in the war in Irak was to capture and kill Irak's dictator Sadam Hussein. One challenge of U.S involvement in the war in Irak was to demonstrate that Sadam Hussein had arsenals of weapons of mass destruction. The US troops never find these weapons.
The U.S. government openly stated that they would view any European interference in Latin America as "an act of aggression". This mentality was articulated in the famous "Monroe Doctrine".
Whenever the Nile River flooded, it left behind nutrient-rich soil. Because of this, Egyptian farmers would often plan their farming cycle accordingly, harvesting their crops BEFORE flooding season and planting AFTER the flooding season
For his part, Hitler wanted a nonaggression pact with the Soviet Union so that his armies could invade Poland virtually unopposed by a major power, after which Germany could deal with the forces of France and Britain in the west without having to simultaneously fight the Soviet Union on a second front in the east.
