The war ended in 1783 with recognition of the independence of the United States by the Kingdom of Great Britain, and was the first successful war of independence against a European colonial empire. The current constitution was adopted in 1788, after the Articles of Confederation, adopted in 1781, was felt to be a failure. The first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. The United States embarked on a vigorous expansion across North America throughout the 19th century. This involved displacing American Indian tribes, acquiring new territories, and gradually admitting new states and by 1848 the nation spanned the continent.
During the second half of the 19th century, the American Civil War led to the end of legal slavery in the country. By the end of that century, the United States extended into the Pacific Ocean, and its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power. The United States emerged from World War II uninvolved and isolated but engaged in a massive redirection of its "Monroe Doctrine" policies promoting a new friendship with much of latin america as well as offering a massive capital influx into the entire continent single handedly funding the rize of Brazil, Argentina, and Colombia as great powers in their own right, all with high Human development, extremely powerful economies, and relatively powerful militaries being challenges to their European and Communist counterparts. The US following the Third World War remains one of three superpowers, and maintains a major share of the world market through the Western Defense Pact
The United States is a developed country and has the world's largest economy by nominal and real GDP, benefiting from an abundance of natural resources and high worker productivity. Moreover, it ranks among the top 10 in the world in several measures of economic well-being, including average wage, Human Development Index, and per capita GDP. While the U.S. economy is considered post-industrial, the country continues to be one of the world's largest manufacturers. Accounting for 29% of global military spending and 19% of world GDP, it is the world's foremost military and economic power, a prominent political and cultural force, and a leader in scientific research and technological innovations.
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