Do you have anything to back up those claims? I don’t know how long CITH was illicitly practiced in the United States; how do you need it was “a relatively short time”? I figure it must have been around for some time to have been so prevalent as to cause the NCCB to petition Rome for the indult.
From Memoriale Domini:
The Apostolic See therefore emphatically urges bishops, priests and laity to obey carefully the law which is still valid and which has again been confirmed. It urges them to take account of the judgment given by the majority of Catholic bishops, of the rite now in use in the liturgy, of the common good of the Church.
Quapropter Apostolica Sedes Episcopos et sacerdotes et fideles vehementer hortatur, ut validae iterumque confirmatae legi studiose obsequantur, sive ad iudicium a maiore catholici Episcopatus parte latum, sive ad formam qua hodiernus sacrae Liturgiae ritus utitur, sive denique ad commune ipsius Ecclesiae bonum respicientes.
Where a contrary usage, that of placing holy communion on the hand, prevails, the Holy See — wishing to help them fulfill their task, often difficult as it is nowadays — lays on those conferences the task of weighing carefully whatever special circumstances may exist there, taking care to avoid any risk of lack of respect or of false opinions with regard to the Blessed Eucharist, and to avoid any other ill effects that may follow.
Sicubi vero contrarius usus, sanctam nempe Communionem in manibus ponendi, iam invaluerit, eadem Apostolica Sedes, ut Episcopales adiuvet Conferentias ad pastorale officium implendum, pro hodierno rerum statu saepe difficilius, iisdem Conferentiis committit onus ac munus peculiaria adiuncta, si quae sunt, expendendi, dummodo tamen et quodvis praecaveatur periculum, ne reverentiae defectus vel falsae de Ssma Eucharistia opiniones irrepant in animos, et alia etiam incommoda sedulo tollantur.
In such cases, episcopal conferences should examine matters carefully and should make whatever decisions, by a secret vote and with a two-thirds majority, are needed to regulate matters. Their decisions should be sent to Rome to receive the necessary confirmation, accompanied with a detailed account of the reasons which led them to take those decisions. The Holy See will examine each case carefully, taking into account the links between the different local churches and between each of them and the Universal Church, in order to promote the common good and the edification of all, and that mutual good example may increase faith and piety.
Porro hisce in casibus, ad eiusmodi usum recte ordinandum, Episcopales Conferentiae opportunas, prudenti praemisso examine, deliberationes capient, quae secretis suffragiis duabusque e tribus partibus suffragiorum faventibus ferendae sunt; quas quidem deliberationes deinde Sanctae Sedi, necessariae confirmationis causa, proponent, adiecta accurata expositione causarum, quibus ad eas capiendas impulsi sunt. Sancta Sedes singulos casus accuarate perpendet, illius haud oblita coniunctionis, quae variis locorum Ecclesiis inter se vel earum unicuique cum Ecclesia universa intercedit, ad provehendum commune bonum communemque aedificationem, atque ad fidei pietatisque incrementum, quod mutuo ad exemplo profluit.
It seems to me from Memoriale Domini that in order to request the indult, the practice of Communion in the hand must already have been “prevailing” against the law and discipline of the Church which the Apostolic See was urging them to obey.