"The Union, which can alone insure internal peace, and external security to each State, Must and Shall be Preserved, cost what it may in time, treasure, and blood"

This quote by George B. McClellan stresses the value of the Union in maintaining peace and security for each state. He is recommending that the Union is the only method to make sure that each state is safe from external risks which internal peace is kept. He is also recommending that the Union must be maintained, no matter the expense in terms of time, cash, and lives. This quote is a pointer of the significance of the Union and the sacrifices that have actually been made to keep it together. It is a call to action for people to continue to support the Union and to be happy to make whatever sacrifices are needed to keep it strong. McClellan's words are a suggestion of the importance of the Union and the requirement to protect it at all expenses.