 <translate> The question is: The American Civil War was fought in the United States from 1861 to 1865. The result of a long-standing controversy over slavery, war broke out in April 1861, when Confederates attacked Fort Sumter in South Carolina, shortly after Abraham Lincoln was inaugurated. The nationalists of the Union proclaimed loyalty to the U.S. Constitution. They faced secessionists of the Confederate States of America, who advocated for states' rights to perpetual slavery and its expansion in the Americas.

Answer this question based on the passage: when did the first battle of the civil war take place?
Step-by-step reasoning process: The important part for answering this question is: The result of a long-standing controversy over slavery, war broke out in April 1861, when Confederates attacked Fort Sumter in South Carolina, shortly after Abraham Lincoln was inaugurated.
 <yor> Ìbéèrè náà ni pé: Ogun Abẹ́lé ti Amẹ́ríkà wáyé ní Orílẹ̀-Èdè Amẹ́ríkà láti ọdún 1861 sí ọdún 1865. Àbájáde awuyewuye tó ti wà tipẹ́tipẹ́ lórí ọ̀ràn ìfiniṣẹrú ni pé, ogun bẹ́ sílẹ̀ ní oṣù April ọdún 1861, nígbà táwọn ọmọ ogun Confederate gbógun ti Fort Sumter ní South Carolina, kété lẹ́yìn tí Abraham Lincoln gorí ìtẹ́. Àwọn tó fara mọ́ ìjọba àpapọ̀ sọ pé àwọn fara mọ́ òfin orílẹ̀-èdè Amẹ́ríkà. Wọ́n dojú kọ àwọn tó ń fẹ́ kí àwọn ìpínlẹ̀ tó wà lábẹ́ Àjùmọ̀ní Orílẹ̀-èdè Amẹ́ríkà pínyà, àwọn tó ń jà fún ẹ̀tọ́ àwọn ìpínlẹ̀ láti máa lo ẹrú títí ayé àti láti mú kí ó gbòòrò dé àwọn ilẹ̀ Amẹ́ríkà.  Dáhùn ìbéèrè yìí ní ìbámu pẹ̀lú àyọkà náà: ìgbà wo ni ogun abẹ́lé àkọ́kọ́ wáyé? Ohun tó máa jẹ́ kó o lè dáhùn ìbéèrè yìí ni pé: Ogun kan tó wáyé ní April ọdún 1861, nígbà táwọn ọmọ ogun Confederate gbógun ti Fort Sumter ní South Carolina, láìpẹ́ lẹ́yìn tí Abraham Lincoln gorí ìtẹ́, jẹ́ àbájáde àríyànjiyàn tó ti wà tipẹ́tipẹ́ lórí ọ̀ràn ìfiniṣẹrú. 