The United States of America (USA) has one of the most influential modern histories, emerging in the late 18th century after declaring independence from Great Britain in 1776. Considered a global leader in democracy and innovation, the USA pioneered advancements in science, technology, economy, and culture that shaped the modern world. Its rich cultural heritage reflects a unique blend of Native American roots, European colonisation, African heritage, and continuous immigration from all over the globe. The USA played a central role in both World Wars and emerged as a superpower in the 20th century, leading the way in international politics, economics, and space exploration. Today, the United States is recognised for its diverse society, democratic values, and global influence in nearly every sphere of modern civilisation.