The answer is the style of the courts changed and how people aren't allowed to hit each other or that would be a foul. on the person that hit you and a lot of other rules weren't allowed now than they were allowed in the old days.
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Well maybe it's because over time people find ways to make the game more fair. For example: a long time ago there was no 24 second shot-clock, so during crunch time in the 4th quarter the team that's up (winning) will hold the ball and not score and wait until the game clock expires and they win. Now in the NBA people start to notice how unfair this is, people shouldn't stop playing. To make the game more fair, and give the team that's down (losing) a chance to catch up, they designed the 24 second shot-clock rule, which both teams has 24 seconds to score, if the clock goes out and they still have not made a basket or the ball has NOT touched the rim, it's a "shot-clock violation" and the other team gets the ball.
Basically Basketball rules change because people find a way to make it more fair for both teams.
a change that has been made in basketball is the 3-point shot Also dunking was added too. Dribbling Backboards Basketball courts A REAL BASKEBALL A NET A RIM CLOTH'S
Slightly taller rims I believe, and Plexiglas backboards as opposed to regular glass, which ran the risk of being broken.