>>15479412a quick search suggests march was originally the first month of the year, ending with december as the tenth.
January and february were later "added" by King Numa Pompilius of Rome.(January named after Janus(the roman god of doors and beginnings, interesting) and february after "februa" festival)
In 1582 Pope Gregory changed the start of the year to January 1st; England and the American colonies didnt follow suit until 1752
as far as reasons for why they did this, dont know dont care done doing your research for you
