The United States expands beyond its borders, emerging as a global power, while Germany rises to prominence in Europe. Imperialism and technology bind the world together, amplifying tensions and conflicts. World War I shatters the global order, and the Russian Revolution ignites an era of ideological confrontation. In the postwar world, nations seek new systems and societal reforms to guide the future. Humanity lays the groundwork for modern civilization amid hope, turmoil, and profound transformation.