The article is an attempt to analyse the problem of multiculturalism on the example of the influence of the five minority communities listed in the title in the perspective of the security of Poland in the period between 1918 and 1939. The considerations presented in this article are an addendum to the issues related to the policy of the authorities of the Second Republic of Poland on national minorities and its influence on the internal security of the state. This subject was undertaken by the Author earlier when he analysed the activity of the representatives the German and Ukrainian minority. The article presents potential factors which can destabilise internal security, especially at the social level, as a result of forces in the environments of the indicated national and ethnic minorities in the II RP. The presented arguments allow to conclude that during the whole interwar period the II RP authorities had to struggle with multiculturalism related to the presence of Belarusian, Lithuanian, Jewish and Silesian minorities because in their environment centrifugal forces were occurred many times and posed a threat to the internal security of the newly re-established Polish state. What is more, it turned out that the social and cultural policy of the II RP was not sufficiently wide-ranging for the above mentioned minorities. However, there were also other factors which constituted serious obstacles in pursuing the policy of efficient integration in the II RP society. It is possible to indicate here as an example the aversion of numerous representatives of these minorities to the social policy imposed by the Polish authorities, major discrepancies in the leading integration vision between significant political factions and also the influence of external propaganda and agitation influencing these minorities.