Following the Soviet Union's collapse and the end of the Cold War in 1991, the U.S. emerged as the world's sole superpower, wielding significant geopolitical influence globally. The U.S. national government is a presidential constitutional federal republic and liberal democracy with three separate branches: legislative, executive, and judicial.

2025年1月29日 · Buoyed by victories in World Wars I and II and the end of the Cold War in 1991, the US remains the world's most powerful nation state. Since the end of World War II, the economy has achieved relatively steady growth, low unemployment, and rapid advances in technology. Visit the Definitions and Notes page to view a description of each topic.

2023年9月18日 · The U.S. is overall the No. 5 best country in the world, according to the 2023 Best Countries rankings, which were based on a survey of more than 17,000 people and gathered perceptions about 87...

2025年1月29日 · Page last updated: Wednesday, January 29, 2025 Contents

2023年12月19日 · Buoyed by victories in World Wars I and II and the end of the Cold War in 1991, the US remains the world's most powerful nation state. Since the end of World War II, the economy has achieved relatively steady growth, low unemployment and inflation, and rapid advances in technology.

6 天之前 · United States, country in North America, a federal republic of 50 states. Besides the 48 conterminous states that occupy the middle latitudes of the continent, the United States includes the state of Alaska, at the northwestern extreme of North America, and the island state of Hawaii, in the mid- Pacific Ocean.

2025年1月21日 · The USA is the world's foremost economic and military power, with global interests and an unmatched global reach. America's gross domestic product accounts for close to a quarter of the world...

2023年3月11日 · Explore the United States in a whole new way with our US World Map featuring all 50 states. Perfect for travelers, educators, and geography enthusiasts.

2024年1月22日 · Covering a total area of 9,833,520 sq. km, the United States is the world's 3rd largest country. Located along the northern shore of the Potomac River in the federal district of Columbia is, Washington D.C. - the country's capital city.

2023年11月7日 · It is a constitutional based republic located in North America, bordering both the North Atlantic Ocean and the North Pacific Ocean, between Mexico and Canada. There are 50 states and the District of Columbia. US major rivers are Colorado, Mississippi and Missouri.