beginning in 1923 i think
Look for a historic event called Paul revere between 1497 and 1781 and you will find your answer
One of the biggest empires in world history!
They were all slave states that had remained in the Union and this is what Missouri, Kentucky, Maryland and Delaware had in common during the Civil war. The correct option among all the options that are given in the question is the second option. I hope that this is the answer you were looking for and it helped you.
