What female transcendentalist
created the first organized
kindergarten in the U.S. ?

First kindergarten in the U.S. established by Mrs. Karl Schurz in Wisconsin in 1852

Darn. I messed this one up ! I should
have put "First English-speaking
kindergarten", so your answer is right!
I was looking for Elizabeth Palmer Peabody.

Thanks for the answer Jenny !

To make matters worse (when asked this question at a Trivia contest), thee is even another distinction.

The first kindergarten in the United States was founded in Watertown, Wisconsin by Margarethe (Margaretta) Meyer Schurz (wife of activist/statesman Carl Schurz). Margarethe Schurz initially taught five children in her home (including her own daughter Agatha) in Watertown, Wisconsin, but was so successful that she opened her first kindergarten in America in 1856. While Schurz's first kindergarten was German-language, she also advocated the establishment of English-language kindergartens. The first English-language kindergarten in America was founded in 1859 in Boston by Elizabeth Peabody, who received her first exposure to a kindergarten from Margaretta Schurz in Watertown. Margaretta Schurz’s older sister Bertha Meyer Ronge opened Infant Gardens in London (1851), Manchester (1859) and Leeds (1860). The first publicly financed kindergarten in the United States was established in St. Louis in 1873 by Susan Blow. - Wikipedia