C I think because it’s dividing between those for slavery
Kentucky was a border state during the Civil War.
Thousands of men chose to enlist in the Union Army.
The United States first began developing nuclear weapons in 1939, during World War II, under the order of President Franklin Roosevelt. Motivation was the fear that US was engaged in a race with Nazi Germany to develop nuclear weapon. This project is best known as Manhattan Project.
Answer:
The Industrial Revolution sweeping across Europe and America in the late 18th century.
Explanation: