That claim actually blew me away when I first heard it. Islam didn’t have any presence in the US until, IIRC, the very late 19th century.
Islam has had some presence in America for a very long time, at least back to the 1600s, but it was relegated to a small portion of the slaves we brought over and some settlers. Many of the Founders mention them, and Jefferson specifically included them when writing about religious freedom. The 1800s saw some Muslim immigration, individuals and small communities. Any “contribution” of Islam was simply the contribution of the people who happened to be believers. The expansion of Islam into any kind of influential force based on an Islamic identity in the US didn’t happen until the 1900s.
A simple fact explains it best: Almost all of the mosques in the US today were built post-WWII.