▁En rag ed , ▁Ur qu iza ▁res umed ▁military ▁host ilities ▁against ▁Buenos ▁Aires . ▁He ▁defeated ▁Mit re ▁at ▁the ▁Battle ▁of ▁C ep eda , ▁and ▁laid ▁sie ge ▁to ▁the ▁city . ▁Most ▁feder als ▁thought ▁that ▁Ur qu iza ▁should ▁occup y ▁Buenos ▁Aires ▁and ▁imp ose ▁the ▁Constitution ▁on ▁the ▁reb elli ous ▁province . ▁However , ▁Ur qu iza ▁just ▁stayed ▁outside , ▁and ▁sought ▁the ▁med iation ▁of ▁the ▁Par agu ay an ▁Francisco ▁Sol ano ▁López . ▁Buenos ▁Aires ▁would ▁call ▁a ▁Const itu ent ▁Assembly , ▁to ▁accept ▁the ▁National ▁Constitution ▁or ▁request ing ▁am end ments , ▁and ▁re join ▁the ▁Confeder ation . ▁ ▁The ▁Assembly ▁requested ▁several ▁am end ments , ▁the ▁most ▁important ▁of ▁which ▁was ▁that ▁Buenos ▁Aires ▁would ▁not ▁be ▁the ▁capital ▁city ▁of ▁Argentina . ▁This ▁would ▁allow ▁the ▁city ▁to ▁keep ▁the ▁exclusive ▁use ▁of ▁the ▁port . ▁With ▁Santiago ▁Der qui ▁as ▁the ▁new ▁president ▁of ▁the ▁Confeder ation , ▁the ▁am end ments ▁were ▁accepted , ▁and ▁the ▁new ▁National ▁constitution ▁prom ul g ated . ▁However , ▁the ▁murder ▁of ▁governor ▁José ▁Antonio ▁Vir as oro ▁generated ▁new ▁military ▁conflicts ▁between ▁Buenos ▁Aires ▁and ▁the ▁Confeder ation . ▁Mit re ▁defeated ▁Ur qu iza ▁at ▁the ▁battle ▁of ▁Pav ón ▁in ▁ 1 8 6 1 , ▁and ▁Buenos ▁Aires ▁returned ▁to ▁the ▁Confeder ation , ▁which ▁would ▁be ▁the ▁modern ▁Republic ▁of ▁Argentina . ▁ ▁See ▁also ▁▁ ▁Name ▁of ▁Argentina