Treaty of Traverse des Sioux: Sioux tribes cede land in Iowa and Minnesota.
Erie Railroad completes its line to the West.
Sojourner Truth delivers her famous speech Ain't I A Woman to a Women's Rights Convention in Akron, Ohio (May).
Bloomers invented by Elizabeth Smith Miller; named for feminist Amelia Bloomer.
The American branch of the Young Men's Christian Association (YMCA) opens.