How can you explain the rapid economic progress of the union republics and autonomous republics

How can you explain the rapid economic progress of the union republics and autonomous republics of the USSR in the post-war period?

This was facilitated, for example, by such a wartime phenomenon as the evacuation of enterprises. The fact is that after the war, many of them did not return to their former place and the personnel with the equipment could stay there, and in the old place they began to restore these factories again. This clearly added capacity for the state’s industry. In addition, there was great enthusiasm among the population in order to restore what was destroyed during the war. This also includes the forced labor of prisoners and prisoners. Thus, it was possible to reach a significant level of development.