In the enormous upheaval that followed, one of these species would gain ascendancy.

Compression ignition or diesel engines were first used about 1910 for smaller sternwheel towboats, but did not gain ascendancy until the late 1930s, when diesel-powered propeller boats appeared.

Mine turned naturally curly (hormones) just as the ironed look gained ascendancy.

With no existential threat and only internal political strife, the worst aspects of the cadre system gained ascendancy from the early 1960s to 1978.

However, most scholars today would agree that postmodernism began to compete with modernism in the late 1950s and gained ascendancy over it in the 1960s.