WHO ARE THESE EASTERN CATHOLICS?

WHO ARE THESE EASTERN CATHOLICS?
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Catholics are generally unaware that we have millions of brothers and sisters who are not themselves part of the Roman Catholic Church. Indeed, even the term "Roman Catholic" isn't quite right as it was actually a derogatory or mockery term assigned to us by Anglican Protestants, who were trying to legitimize their own use of the term "Catholic" over and against the Church loyal to the Pope of Rome.
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The Catholic Church directly under the jurisdiction of Rome is properly and canonically termed the "Latin Church". All official Church documents simply use the term, "Catholic Church." And contrary to popular belief, most of the day-to-day work performed by the Holy Father is not in his role as pope and pastor of the Universal Church but in his position in the Latin Church as the bishop of Rome and the patriarch of the West. We in the Roman Church (Latin Rites) is governed under the Code of Canon Law.
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Those other churches not part of the Latin Church have their own hierarchies and liturgies, as well as their own distinct apostolic lineages. They may look and act like Eastern Orthodox churches, but they recognize the pope of Rome as the head of the visible Church on earth and have suffered for the cause of that unity. They are simply called the Eastern Catholics, and is governed by the Code of Canon Law on Eastern Catholic Church.
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According to the Constitution of the Church "Lumen Gentium", the Catholic Church is understood to be "a corporate body of Churches," united with the bishop of Rome, who serves as the guardian of unity. The other Catholic Churches are not merely Catholics with papal permission to use different liturgies. They were also founded by the apostles and are particular, autonomous Churches of their own rightful existence (sui iuris).
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Any individual Roman Catholic may freely attend and receive the sacraments in any of those 4 other rites (i.e Byzantine, Alexandrian, Armenian, Syriac). Sacramental rites might