Pilar and his associates stopped to cooperate with Catholic Association because of their political ideology, even though before that, they were in good relations to Stadler. Second reason for freezing of relations was effort of HKU to unite Bosnia and Herzegovina with Croat lands, which Bosnian Muslims and Serbs didn't approve. Since both, HNZ and HKU were part of Pan-Pravaštvo organization, both parties continued to cooperate in 1911 until the end of the World War I.
On the election for Bosnian legislature in 1910, HNZ won 12 out of 16 seats reserved for Catholic representatives. After the end of World War I, and with creation of Kingdom of Yugoslavia, HNZ ceased to exist.
In February 2010, president of the HSP BiH, Zvonko Jurišić, president of the Croat Union of Herzeg-Bosnia, Petar Milić and Brkić met and agreed to act under a single name, Croatian Party of Rights of Bosnia and Herzegovina. At the 2010 election, HSP BiH entered into a Croatian Coalition along with Croatian Democratic Union 1990. By this act, HNZ once again opposed HDZ BiH.[1]