THE WORLD WAR II.
broke the international agreement and finally invaded most of and the World War II started.
There were groups of countries.
ü The Powers: Germany, Italy and .
ü The Allied Powers: Democracies ( France, the United , the United States) and communist countries ( Soviet Union and Republic of ).
The Nazi state persecuted and there was the mass murder most brutal in history.
Both Powers developed better .
ü Aircrafts became more advanced and were an important military forced.
ü The development of helped to detect of the enemy and the United States developed the first atomic .
ü They dropped two bombs on Japan in , making the end of World War II.