The 29-Star Flag. When Iowa joined the Union on December 28, 1846, the U.S. Flag “officially” added a 29th star on July 4, 1847. In 2000, the USPS issued a series of flag stamps and this is the version of the 29-star flag used. Prior to the 48-star flag designed in 1912, there was no set pattern for arranging stars on the American flag. The flag shown above is the 29-star flag in the House Chamber of Old Capitol in Iowa City.
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