15.16th century, two great events happened in the world: the Renaissance and the opening of new air routes. The former liberates people, while the latter makes the world go whole. /kloc-at the end of 0/9, the second industrial revolution began, mankind entered the electrical age, human life changed dramatically and improved, monopoly organizations appeared, major capitalist countries entered the imperialist stage, and the world was basically divided.

Revelation: 1 Man is the essence of the universe, and the spirit of all things should be people-oriented.

2. Science and technology are the primary productive forces.

Major countries in Europe and America became powerful countries on the basis of plundering Asian, African and Latin American countries, dripping with dirty blood.

4. The world is getting closer and closer.

5. The problems of environment and resources cannot be ignored.