Charles Taze Russell founded the Watch Tower Bible & Tract Society in 1881 and began publishing "The Watch Tower" as well as founded the religious organization known as "The International Bible Students." From 1909 to 1931 The International Bible Students severed into over 7 groups -
3 groups under the banner of "Associated Bible Students"
Pastoral Bible Instituted that published "The Herald of Christ's Kingdom," a monthly magazine like the Watchtower.
The Standfast Bible Association that was started because of Rutherford's hypocrisy in teaching pacifism, but purchasing U.S. War Bonds during WWI. Elijah's Voice Society splintered off that group.
Dawn Bible Students Association who publish the magazine "The Dawn - Herald of Christ's Presence." The Independent Bible Students splintered from them in 1974 at a convention.
Not to mention the Free Covenant Believers who published the magazine "The Kingdom Scribe," the Christian Discipling Ministries International, the Free Bible Students based in Germany who were also persecuted during WWII and also published the magazine "Der Pilgrim," the Layman's Home Missionary Movement started by Paul S. Johnson who believed he, not Rutherford, should have been Russell's successor. The Epiphany Bible Students Association and Laodicean Home Missionary Movement. Then of course we finally have the Friends of Man movement that started in 1917.
All of these groups, including Jehovah's Witnesses splintered from Charles Taze Russell's International Bible Students. They all held meeting, attended conventions, many published periodical magazines. Even Charles Taze Russell's International Bible Students is a splinter group of the Millerites who believed Christ would return and end would come in 1843. When it didn't, many left. Just like many left the International Bible Students when Rutherford conducted his hostile takeover of the Watch Tower Bible & Tract Society.
So the question is - Why are Jehovah's Witnesses the one, true religion? Other than self-proclamation, why in 1919 did the International Bible Students produce the "Faithful and Discreet Slave"? Why wasn't it in 1831?
Also, Israel was "God's chosen people" beginning with the covenant with Abraham. It also ended, according to Jehovah's Witnesses, when the nation of Israel rejected Jesus and Christianity?
How do we know that it wasn't one of the many other groups who also gave false prophecy claiming the end would come in a certain year are God's chosen people on Earth? The all go to meetings and conventions. They publish magazines. They go door-to-door announcing Jehovah's Kingdom. They experience growth. They have all been persecuted for their beliefs. How can one say they don't have "the Truth"?