What are the star on the american flag for?
The flag of the United States of America in 1964 had 50 stars, the same as today. The 50 star US flag is the longest flying flag in US history, second only to the 48 star flag. When Alaska was admitted to the USA in 1959 we had a 49 star flag. Then in 1960 another star was added for the new state of Hawaii making it a 50 star flag.
Indiana is the 19th state on the American Flag. Actually, individual stars do NOT specifically refer to named states. That is, you cannot point to a star on the flag and say "that star represents state X". This is in keeping with the idea of a collective union ("from many, one"), not a group of individual states.
No one. There is no such thing as the American flag. Should you mean the US flag then there are various companies that make 50 star US flags, not all of them US companies. If you are referencing who designed the first 50 star US flag, that would be Robert G. Heft. Heft's flag design was chosen and adopted by presidential proclamation after Alaska and before Hawaii was admitted into the union in 1959.