Although the school grew slowly in those early years, by 1930 it had reached its pre-World War I size of 350–450 students. Like many colleges in the United States, the end of the war led to the fastest enrollment increase in Calvin's history. By 1950 the enrollment had climbed to 1,270 and Calvin joined the M.I.A.A. The enrollment increase led to space limitations at the Franklin Campus. William Spoelhoef became president of Calvin in 1951.
