<P> Armed conflict began in 1775 as Patriots drove the royal officials out of every colony and assembled in mass meetings and conventions . In 1776 , the Second Continental Congress declared that there was a new , independent nation , the United States of America , not just a collection of disparate colonies . With large - scale military and financial support from France and the military leadership of General George Washington , the American Patriots won the Revolutionary War . The peace treaty of 1783 gave the new nation the land east of the Mississippi River ( except Florida and Canada ) . The central government established by the Articles of Confederation proved ineffectual at providing stability , as it had no authority to collect taxes and had no executive officer . Congress called a convention to meet secretly in Philadelphia in 1787 . It wrote a new Constitution , which was adopted in 1789 . In 1791 , a Bill of Rights was added to guarantee inalienable rights . With Washington as the first president and Alexander Hamilton his chief political and financial adviser , a strong central government was created . When Thomas Jefferson became president he purchased the Louisiana Territory from France , doubling the size of the United States . A second and final war with Britain was fought in 1812 . </P>
<P> Armed conflict began in 1775 as Patriots drove the royal officials out of every colony and assembled in mass meetings and conventions . In 1776 , the Second Continental Congress declared that there was a new , independent nation , the United States of America , not just a collection of disparate colonies . With large - scale military and financial support from France and the military leadership of General George Washington , the American Patriots won the Revolutionary War . The peace treaty of 1783 gave the new nation the land east of the Mississippi River ( except Florida and Canada ) . The central government established by the Articles of Confederation proved ineffectual at providing stability , as it had no authority to collect taxes and had no executive officer . Congress called a convention to meet secretly in Philadelphia in 1787 . It wrote a new Constitution , which was adopted in 1789 . In 1791 , a Bill of Rights was added to guarantee inalienable rights . With Washington as the first president and Alexander Hamilton his chief political and financial adviser , a strong central government was created . When Thomas Jefferson became president he purchased the Louisiana Territory from France , doubling the size of the United States . A second and final war with Britain was fought in 1812 . </P>
when did america become known as the united states
when did america become known as the united states
1776
1776