It is proved in the frame of standard quantum mechanics that selection of diierent ensembles emerging from measurements of an observable leads to identiication of corresponding reductions of the initial, premeasured state. This solves the problem of \nonlocality\ observed in EPR-Bohm-type experiments. The phenomenon of \nonlocality\ is well-established in EPR-Bohm-type experiments (EPRB). For example, in entangled two-particle systems 1,2], a choice of measurement in one of the two causally separated channels innuences results of measurements in another channel. The observed correlations are predicted by quantum mechanics (QM); but since measurement procedures are not included in its formalism, their mutual, long-distance innuence remains inexplicable. This diiculty is cleared up in this work by analyzing logical statements about quantum states in the frame of the standard QM formalism, and by clarifying the meaning of measurement procedures. This approach permits us to nd logical connections otherwise hidden. It is proved that in EPRB all such connections are local. In general, the choice of measurement in one of the channels locally deenes the reduction of a premeasured state, which in turn deenes connections between channels in the usual way.