Why were the actions of the Second Militia (as opposed to the actions of the First Militia) successful?

Because they acted in a coordinated and harmonious manner. Thus, by the end of 1612, Moscow was finally liberated from the Polish invaders. We can say that this was the end of the troubled period in the history of the Russian state. The next year, a new tsar was elected, who became Mikhail Fedorovich. Despite the fact that the turmoil was over, it had many negative consequences that almost led the state to decline.