Misc: what is the rear portion of a horses head called?

Questions

On This Day In January 1821 - The first native-born American______ , Elizabeth Ann Seton, died in Emmitsburg, MD.?

On This Day In January 1850 - The first American ice-______ club was organized in Philadelphia, PA.?

On This Day In January 1884 - The socialist Fabian Society was ______ in London.?

On This Day In January 1885 - Dr. William Grant performed the first successful______ . The patient was Mary Gartside.?

On This Day In January 1896 - ______ became the 45th U.S. state.?