The Tribulation was not to be a worldwide event and had nothing to do with 1914.
18
When therefore you see the abomination of desolation, which was
spoken of
through
Daniel the prophet, standing where it ought not
in the holy place
(let him
who
reads understand), that is to say, when you see Jerusalem
compassed with
armies,
then know that her
desolation
is at hand.”
19
Then let
those who are in Judea
flee to the mountains, let him who is on the
housetop
not go down to take out things that are in his house. Neither
let him which
is
in the field return back to take his clothes.
20
For these are
days
of
vengeance, that all things which are written may be fulfilled.”
21
But woe to those
who are with child and
to those who are breast
feeding
in those
days!”
22
And pray
that your flight
be not in the winter,
neither on a Sabbath,”
23
For then
shall be great tribulation,
such as was not since the beginning of the world to this time,
no, nor ever shall be,
for there will be
great distress on the
land,
and wrath
to
this people.
24
And they shall fall
by the edge of the sword,
and shall be led
away captive into all nations:
and Jerusalem shall be trodden down of the Gentiles, until the times
of the Gentiles be fulfilled.
So the great tribulation was to be a one-time, non-repeatable event in history; a fairly local event affecting the Jews in and around Jerusalem and leading to their death or dispersion among the nations. Jesus provided the Sign (Jerusalem being surrounded by armies) to Flee and escape Jerusalem’s Tribulation & Destruction: Matthew 24: 18-23 The plight of the Jews who didn't heed Jesus' instruction to flee is aptly described in Luke 21: 21-24.