Conflict

Throughout the 20th century, scientists worked on improving agriculture, especially in areas with high populations. Some of the technologies developed included better irrigation systems so farmers could get water to their crops. New machinery was built to handle larger production and to take the burden of agriculture work off of humans. New chemical fertilizers and pesticides were created to increase food production, and new varieties of grains and livestock were developed also for greater production. The Green Revolution has had only limited success.

(1931- ), leader of the Soviet Union from 1985 to 1991. His policies of Perestroika and Glasnost, which aimed at revitalizing the Soviet Union contributed to the downfall of communism.

(1712-1786), King of Prussia from 1740 to 1786. Enlightened despot who enlarged Prussia by gaining land from Austria when Maria Theresa became Empress.

(1863-1914) Archduke of Austria, nephew to the Emperor. He was assassinated by Gavrilo Princip in Sarajevo, Bosnia in 1914. This resulted in the start of World War I.

To increase.