After the 1931 merger, relatively few practices and customs changed drastically within either of the uniting traditions, largely because its members, like most Americans, were overwhelmed by, first, the Great Depression, and, later, World War II. It would not be until after the latter concluded that the CC churches would embark on anything like a major church extension program; this was the case, of course, with most U.S. denominations during this period, as their churches often struggled to merely stay open, with little or nothing left over for mission work.