Baseball, Basketball and American football (not to be confused with rugby) originated in the US.
Another answer
Basketball was created by James Naismith, a Canadian sports coach. And the first explicit references to baseball appear to come from England.
*THE FOLLOWING SPORTS WERE CREATED IN THE USA*
BASKETBALL - BASEBALL
Basketball was created in Springfield, Massachusetts, USA in 1891
by James Naismith (Yes we know He was a Canadian)
Source:kansasheritage.org/people/naismith.html
Baseball was created in 1845 by Alexander Cartwright Source:baseball.suite101.com/article.cfm/the_first_baseball_game_a_primer
If the sport of rounders was the Liverpool and Scottish Rounders Association, formed in 1889, And if Alexander Cartwright created Baseball in 1845 then it first originated in the US. Besides the field and rules are so different, yes they both use bats, balls, bases, with rounders or cricket it has an oval shape Field, but with Baseball is diamond shape, one batter at a time, use cylinder shaped bat, not flat. Baseball uses gloves, has fouls lines, yes the idea Baseball might have been influenced by Cricket & Rounders, But all and all Baseball is an American sport.
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I believe the only sport to be invented in modern day America was Basketball, but I think it was invented by a Canadian living in the US.
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