Coach named Walter Camp is often given credit for inventing American football because about 100 years ago he created many of the rules in American football that we have today.
Even though American football is hugely popular in the United States, it owes a lot to a different sport started in a different country.
Can you guess?
American football has a lot in common with another sport called RUGBY which started in Great Britain.
It's the rules that now make American football a different sport from rugby.
Many of these rules were invented by Walter Camp.
That's why he is called "The Father of American football".