Question

Look at the american flag once again.why are there 13 stripes?

Answer 1

13 stripes  on  the american flag  symbolize the 13 original colonies that revolted against British rule.
  13 полос на американском флаге символизируют 13 первых колоний, которые восстали против британского правления.

Answer 2

The American flag has 13 stripes to represent the original thirteen colonies that declared independence from British rule and formed the United States of America. These colonies were Connecticut, Delaware, Georgia, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, and Virginia. The stripes on the flag, alternating between red and white, symbolize these original states. The 13 stripes have remained on the flag as a tribute to the nation's history and its founding principles.