World War 2 which has started in 1939 was the most devastating war the world has ever fought. One of the reasons for that devastation was because the Third Reich forces used a tactic called Blitzkrieg which was designed the following way: At first Dive Bombers went in to strike enemy points (JU-87 Stukas) were the most popular for those missions. After the bombardment went the Wehrmacht (tank) forces and the Infantry. The other devastating problem for the Allies was the new Submarine tactics. Hitlers engineers have developed a submarine known as a U-Boat. Those were mostly used for the blockade of Great Britain to sink allied shipping. The most devastating moment of the war was in 1945 when the United States launched a successful Atomic strike in Hiroshima and Nagasaki causing more then 200,000 casualties from each atomic bomb. In total 75,000,000 people died as the result of battles.
The two types of farm owning developed slavery because the owners of them were allowed to have slaves. The encomienda system was based on the idea that conquerors should have slaves to work for them, and it similarly applied to sugar colonies that had slaves on them. They were responsible for a lot of trafficking of slaves from Africa.
