Ummm. Because they are summer sports, thats kind of the point. If people played baseball when it was cold would that be any fun?
soccer basketball, a lot of summer sports so not ice hockey
what kind of sports where around in the gilded age
there isn't an exact number (what kind of question is this)
every sport you can think of except football, baseball, and hockey.
Netball, Volleyball, Badminton, Ping Pong, Tennis (Basically all sports but netball is very popular)