Well, I took it for granted that I was talking about Faith and Morals. The Church has no competence to teach maths, science, etc.
The Sacraments did not come into existence only upon Conciliar or Papal definitions as they were instituted by Christ, Himself. Definitions of the Sacraments occurred as a development of Sacramental theology usually in response to those who attacked their existence or nature.
The Protestants reduced the number of Sacraments from 7 to 2 which tells us that Matrimony was considered a Sacrament long before the Reformation or Trent. Trent merely reaffirmed Matrimony as a Sacrament.
The morality of Usury has had a chequered history. In the OT it was permitted to charge interest on loans to non-Jews which proves that Usury in itself was not immoral but subject to regulation. You will find that in the history of the Church Usury was at times banned and at times permitted under regulation for mainly practical reasons.
Contd ...