Imagine standing in a crowd of thousands of people. Everyone is waiting to hear one man speak. On October 1, 1949, that happened in Beijing, China. A leader named Mao Zedong climbed to the top of a tall gate. He looked out at the massive crowd below. Then he said five words that changed everything: "The Chinese people have stood up." What did he mean? For over a hundred years, China had been through wars and conflict. Other countries had taken parts of China. Millions of people were poor and hungry. Mao and his followers had fought a long civil war against another group. When they won, Mao announced the birth of a brand-new government. He called it the People's Republic of China. Soldiers marched in a huge parade. Flags waved everywhere. Planes flew overhead. October 1 became China's National Day. Today, China celebrates every year with fireworks and festivals. That one speech in 1949 still echoes through history.