Puljic is on a visit to Washington where he is scheduled to meet US Congressmen, State Department and White House officials and talk about the status of Croats in Bosnia and constitutional reforms recently rejected in that country.
"We must clearly say to the United States: You can't ignore the disappearance of Catholics in Bosnia," Puljic told Croatia reporters after giving a talk in the United States Institute for Peace.
Puljic said that the number of Croat Catholics in Bosnia after the war dropped from 820,000 to 460,000.
The Bosnian Parliament's House of Representatives last week rejected constitutional changes that were aimed at strengthening of central powers and protecting the country from being divided into Republika Srpska and the Federation of Bosnia-Herzegovina.
The Catholic Church in Bosnia opposed the constitutional reforms saying they would strengthen the unequal position of Croats and would lead to their disappearance. Croats are the least numerous people in Bosnia and many believe that they do not have the right to gain an equal position.
The United States supported the constitutional amendments in Bosnia and exerted pressure on all three peoples to adopt them.