National Democracy (Polish: Narodowa Demokracja, also known from its abbreviation ND as "Endecja") was a Polish political movement active from the second half of the 19th century under the foreign partitions of the country until the end of the Second Polish Republic. It ceased to exist after the Nazi-Soviet invasion of Poland of 1939. In its long history, National Democracy went through several stages of development. Created with the intention of promoting the fight for Poland's sovereignty against the repressive imperial regimes, the movement acquired its right-wing nationalist character following the return to independence. A founder and principal ideologue was Roman Dmowski. Other ideological fathers of the movement included Zygmunt Balicki and Jan Ludwik Popławski.