The first 10 years of Syria’s conflict, which started in 2011, killed more than 300,000 civilians, the United Nations said on Tuesday – the highest official estimate to date of conflict-related civilian deaths in the country. The conflict began with peaceful anti-government uprisings that broke out in March 2011 in different parts of Syria, demanding democratic reforms following Arab Spring protests in Egypt, Tunisia, Yemen, Libya and Bahrain that removed some Arab leaders who had been in power for decades. However, it quickly turned into a full-blown civil war that killed hundreds of thousand…