Why did the communists fail to establish a Soviet system in Eastern Europe on the model of the USSR?

Despite the fact that under the pressure of the USSR in the post-war period in Eastern Europe, the influence of the communists sharply increased, however, one should not forget that the regime of “people’s democracy” existing in the countries of Eastern Europe allowed the existence of a real multi-party system. Therefore, in addition to the communists, a significant share was accounted for by the social democrats, peasant parties and other parties for which the population voted. The Communists, of course, acted competently. They even united with the Social Democrats and “peacefully” took power into their own hands. The communists tried to “crawl” everywhere. In February 1948, they made an attempt to seize the power structures of Czechoslovakia, which were opposed by the Social Democrats, who called on their supporters to resist. And although in the final total, by the middle of 1948, all the countries of Eastern Europe were still established, the power of the communists, the Soviet system on the model of the USSR could not be built, the theoretical possibility of resistance was still too great.