How did puerto rico pose a problem for the united states after the spanish american war?

Puerto Rico, which became an American protectorate under the Treaty of Paris, was very poor. US troops were welcomed in 1898, and the Puerto Ricans greatest hopes were for increased rights and a better economy.  

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others  

it was bribing i think i might be wrong though