The two discoveries that brought a revolution in early man's life are:
1) Agriculture - It helped the early man to produce its own food. this innovation made possible new flux of innovations and ideas the husbandry and domestication of all modern cattle and pets (except dogs), the formation of soldiers and wars, the money, the origin of religion, writing and all the very basis of modern life. Developing all these new outcomes would be impossible without the cooperation and organized structure of agricultural societies.
2) Language and paintings - Language helps them to communicate with each other and painting which they did at that time helped Historians today to know about their life, language, etc.
The Wagner act provides American workers with the legal right to conduct a strike.
This gives the power to the American workers to form a union and opened up discussions with job owners regarding fair working condition.
The Social Security act provides various forms of welfares for American Citizens, especially for the old citizens and the disabled.
Semi-direct democracy is a type of democracy that combines the mechanisms of direct democracy and representative government. In semi-direct democracy, representatives administer daily governance, but citizens keep the sovereignty, being able to control their governments and laws through different forms of popular action: binding referendum, popular initiative, revocation of mandate, and public consultations. The first two forms—referendums and initiatives—are examples of direct legislation.
Usually, the emperor is assassinated.