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“Nation will rise against nation.”​—Matthew 24:7.

Fulfillment: In the early years of the 20th century, many were expecting continued peace. The start of World War I shocked the world and began an era of unprecedented warfare. As the Bible book of Revelation foretold, peace was taken “away from the earth so that they [mankind] should slaughter one another.”​—Revelation 6:4.

More at:
https://www.jw.org/en/library/magazines/g201210/the-last-days/