Authoritarian governments are characterized by the concentration of power in the hands of a single leader or a small group of individuals, who exercise absolute control over the political system and society.

Adolf Hitler, Joseph Stalin, and Mao Zedong are all historical figures who are associated with the rise of authoritarianism in the 20th century. They established totalitarian regimes in their respective countries, characterized by strict control over political, social, and economic life.

Authoritarianism is a political ideology that emphasizes the importance of a strong leader and a centralized government. It is characterized by the concentration of power in the hands of a single individual or a small group, and the suppression of individual liberties and freedoms.

During the 1930s, Germany, Italy, and Japan all experienced a rise in authoritarianism, which contributed to the outbreak of World War II. In Germany, Adolf Hitler and the Nazi Party came to power, while in Italy, Benito Mussolini established a fascist regime. In Japan, the military gained control of the government and pursued aggressive expansionist policies.

Totalitarianism is a political system in which the government exercises complete control over every aspect of society. It is characterized by the suppression of individual liberties and freedoms, the use of propaganda and censorship, and the cult of personality surrounding the leader.

The rise of Adolf Hitler and the Nazi Party in Germany in the 1930s is often seen as a turning point in the rise of authoritarianism in the 20th century. Hitler's aggressive policies and his pursuit of racial purity led to the outbreak of World War II and the Holocaust.

Nationalism is a political ideology that emphasizes the importance of the nation and the subordination of individual interests to the collective. It is characterized by a strong sense of national identity and pride, and a belief in the superiority of one's own nation over others.

During the 1970s, Chile, Argentina, and Brazil all experienced a rise in authoritarianism, leading to the establishment of military dictatorships. These regimes were characterized by the suppression of political dissent, human rights abuses, and economic instability.

Communism is a political ideology that emphasizes the importance of class struggle and the eventual establishment of a classless society. It is characterized by the belief that the means of production should be owned in common, and that there should be no private property.

The fall of the Berlin Wall in 1989, the collapse of the Soviet Union in 1991, and the Tiananmen Square protests in 1989 are all historical events that are often seen as turning points in the decline of authoritarianism in the 20th century.

Liberalism is a political ideology that emphasizes the importance of individual liberty and the limited role of government. It is characterized by the belief in the natural rights of individuals, such as the right to life, liberty, and property.

China has experienced a rise in authoritarianism during the 21st century, under the leadership of President Xi Jinping. Xi has consolidated his power, suppressed dissent, and increased the role of the Chinese Communist Party in all aspects of society.

Conservatism is a political ideology that emphasizes the importance of tradition, order, and stability. It is characterized by a belief in the value of established institutions and customs, and a skepticism of change.

During the 1990s, Rwanda, Yugoslavia, and Somalia all experienced a rise in authoritarianism, leading to the outbreak of civil wars. These conflicts were characterized by ethnic violence, human rights abuses, and political instability.

Socialism is a political ideology that emphasizes the importance of equality and social justice. It is characterized by the belief that the means of production should be owned in common, and that there should be no private property.