The advent of the state-sponsored "full-time amateur athlete" of the Eastern Bloc countries eroded the ideology of the pure amateur, as it put the self-financed amateurs of the Western countries at a disadvantage. The Soviet Union entered teams of athletes who were all nominally students, soldiers, or working in a profession, but all of whom were in reality paid by the state to train on a full-time basis.[171][2][168] The situation greatly disadvantaged American and Western European athletes, and was a major factor in the decline of American medal hauls in the 1970s and 1980s. As a result, the Olympics shifted away from amateurism, as envisioned by Pierre de Coubertin, to allowing participation of professional athletes,[173] but only in the 1990s, after the collapse of the Soviet Union and its influence within the International Olympic Committee.[174][175][176]