Pain in abdomen or muscles, coughing blood, fever, chills, fatigue, vomiting, etc. Google symptoms of the plague. Also if you have a history book there is probably specific symptoms they're looking for to answer this.
The conventions came into being after 1830 are:Colored conventions- which are series of convention held in national and regional level after the american civil war. it was attended by politician, businessman, religious leaders, writers and publishers.
Virginia Constitutional Convention
National Negro Convention Movement
Hope this helps.
The battle between the Merrimack and the Monitor showed that
(D) the North and South were equally matched at sea.