Ask most what happened in 1914 and you'll get told, "Satan was cast out of heaven, therefore World War I started because he knew he only had a short period of time before he got abyssed."
Other say, "Jesus took up kingly rule in heaven and God's will started to be done in heaven (like it hadn't been for sometime previous and heaven was just a variation on the theme of hell."
Your most common answer will be Satan was kicked out of heaven. But they are trying to back away from that and say they never said he was kicked out in 1914. They want wriggle room.
The other thing they say is that 1914 is the end of the 7 gentile times which started 607 BCE when Jerusalem went into Babylonian captivity. They say 7 times = 2520 years. A lot are taken in by this calculation which appears compelling but rests on changing the 20th year of Nebuchadnezzar into his 2nd year and the 3rd year of King Jehoiachin into his 11th and final year (618 BCE). For more info on this - see this site I did - http://olam30.co.uk/key/d01_explanation.php