Oliver Ellsworth moves at the Federal Convention to call the government the United States.

Georgia becomes the fourth state to ratify the United States Constitution

Connecticut becomes the fifth state to be admitted to the United States.

American Pioneers to the Northwest Territory arrive at the confluence of the Ohio and Muskingum rivers, establishing Marietta, Ohio as the first permanent American settlement of the new United States in the Northwest Territory, and opening the westward expansion of the new country.

New Hampshire ratifies the Constitution of the United States and is admitted as the 9th state in the United States.

New York ratifies the United States Constitution and becomes the 11th state of the United States.

Georgetown College, the first Roman Catholic college in the United States, is founded in Georgetown, Maryland (now a part of Washington, D.C.)

Pope Pius VI appoints Father John Carroll as the first Catholic bishop in the United States.

A national Thanksgiving Day is observed in the United States as recommended by President George Washington and approved by Congress.

Rhode Island becomes the last of the original United States' colonies to ratify the Constitution and is admitted as the 13th U.S. state.

The United States enacts its first copyright statute, the Copyright Act of 1790.

The Western Confederacy of American Indians wins a major victory over the United States in the Battle of the Wabash.

U.S. President George Washington exercises his authority to veto a bill, the first time this power is used in the United States.

Kentucky is admitted as the 15th state of the United States.

First celebration of Columbus Day in the USA held in New York

In Washington, D.C., the cornerstone of the United States Executive Mansion (known as the White House since 1818) is laid.

The cornerstone of Old East, the oldest state university building in the United States, is laid on the campus of the University of North Carolina

The United States and the Kingdom of Great Britain sign Jay's Treaty, which attempts to resolve some of the lingering problems left over from the American Revolutionary War.

The United States and Spain sign the Treaty of Madrid, which establishes the boundaries between Spanish colonies and the U.S.

The first elephant ever seen in the United States arrives from India.

Tennessee is admitted as the 16th state of the United States.

The United States takes possession of Detroit from Great Britain under terms of the Jay Treaty.

The Mississippi Territory is organized from disputed territory claimed by both the United States and Spain. It is expanded in 1804 and again in 1812.

The Sedition Act becomes law in the United States making it a federal crime to write, publish, or utter false or malicious statements about the United States government.

The United States Library of Congress is established when President John Adams signs legislation to appropriate $5,000 USD to purchase "such books as may be necessary for the use of Congress".

First Barbary War: The American schooner USS Enterprise captures the Tripolitan polacca ''Tripoli'' in a single-ship action off the coast of modern-day Libya.

Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling the size of the young nation.

In New Orleans, Louisiana, Spanish representatives officially transfer the Louisiana Territory to a French representative. Just 20 days later, France transfers the same land to the United States as the Louisiana Purchase.

Louisiana Purchase: In St. Louis, Missouri, a formal ceremony is conducted to transfer ownership of the Louisiana Territory from France to the United States.

Forces sent by Yusuf Karamanli of Tripoli to retake Derne from the Americans attack the city.

First Barbary War: Yusuf Karamanli signs a treaty ending the hostilities between Tripolitania and the United States.

Construction is authorized of the Great National Pike, better known as the Cumberland Road, becoming the first United States federal highway.

Lewis and Clark return to St. Louis after exploring the Pacific Northwest of the United States.

Robert Fulton's first American steamboat leaves New York City for Albany, New York on the Hudson River, inaugurating the first commercial steamboat service in the world.

The importation of slaves into the United States is banned.

Mary Kies becomes the first woman awarded a U.S. patent, for a technique of weaving straw with silk and thread.

United States annexes the former Spanish colony of West Florida.

Tecumseh's War: The Battle of Tippecanoe is fought near present-day Battle Ground, Indiana, United States.

War of 1812: Great Britain revokes the restrictions on American commerce, thus eliminating one of the chief reasons for going to war.

War of 1812: the United States invade Canada at Windsor, Ontario.