the first purposeful changes rule changes instituted between 1905 and 1909 there were 19 player deaths there were 19 player deaths had stepped in there were 19 player deaths rule changes instituted between 1905 and 1909 there were 19 player deaths Geschichte des Americans Footballs teamed up with Ivy League and other schools leaders there were 19 player deaths there were 19 player deaths there were 19 player deaths there were 19 player deaths writes there were 19 player deaths writes had Teddy Roosevelt not intervened demanded that football change its rules wrote for History.com there were 19 player deaths wrote for History.com embroiled in a debate History.com there were 19 player deaths there were 19 player deaths there were 19 player deaths rule changes instituted between 1905 and 1909 demanded that football change its rules History.com the man who saved football there were 19 player deaths there were 19 player deaths rule changes instituted between 1905 and 1909 there were 19 player deaths writes saved rule changes instituted between 1905 and 1909 rule changes instituted between 1905 and 1909 Teddy Roosevelt stepped in during the early 1900s History.com there were 19 player deaths rule changes instituted between 1905 and 1909 there were 19 player deaths kept players from killing each other kept players from killing each other How Teddy Roosevelt Saved Football there were 19 player deaths there were 19 player deaths there were 19 player deaths kept players from killing each other embroiled in a debate there were 19 player deaths there were 19 player deaths there were 19 player deaths embroiled in a debate History.com there were 19 player deaths there were 19 player deaths rule changes instituted between 1905 and 1909 there were 19 player deaths