In political theory and theology,
to immanentize the eschaton
is a generally pejorative phrase
referring to attempts
to bring about utopian conditions
in the world, and to effectively
create heaven on earth.
Theologically, the belief is akin
to postmillennialism as reflected
in the Social Gospel of
the 1880–1930 era, as well as
Protestant reform movements
during the Second Great Awakening
in the 1830s and 1840s such
as abolitionism.
https://en.m.wikipedia.org/wiki/Immanentize_the_eschaton