Weddings in the United States are the most varied and flexible in the world. There are not many wedding traditions that are unique to the United States because most are derived from other cultures. Most of these customs stem from Europe. Indeed, it is considered an American tradition to follow the traditions of one's culture or religion. That said, some wedding traditions remain as the default the U.S.
It is customary to give newlyweds gifts for their new home together at the wedding reception. To prevent duplicate gifts and having to return gifts that are not liked, most couples "register" at department stores. Couples pick out items they would like to receive as gifts, and their friends and family can choose to buy one of those items.
Additionally, although most American weddings are typically elaborate and involve extensive professional planning, some DIY home weddings in America (or including Americans) can be quite simple in terms of ceremony, albeit costly in terms of the sweat equity involved regarding the logistics.