Louisiana came into the nation as the 18th state and therefore should have had its own flag just like all the previse ones but the U.S. got side track by a War (war of 1812) and so "our" flag had to wait. It was finally presented to congress with 18 stars and 18 stripes and congress quickly voted it down. They decide that all future U.S. flags should have single star for the state and the stripe should represent the "original" 13 colonies/states. Therefore Louisiana was the first state to get the "NEW" flag or get the changed flag.
Here is your students to "speculate" the U.S. flag that could have flown over Louisiana. The question I general ask my students is "What is wrong with the proposed flag?" Most of the time, they don't 'see' it. The answer is simple. Most U.S. flags before and up to now feature a red stripe top and bottom but this one does not. Congress also said the flag looked more like pinstripes and would even get worse as we added states.