These are the choices:
<span>*crop rotation techniques*railroads*selective livestock breeding*electric lightbulb*seed drill</span>
The Cold War was waged on political, economic, and propaganda fronts. I hope this helped :)
I think it is the Battle of Bull Run. The First Battle of Bull Run, also known as the Battle of First Manassas, was the first major battle of the American Civil War. The battle was fought on July 21, 1861, in Prince William County, Virginia, just north of the city of Manassas and about 30 miles west-southwest of Washington, D.C.
Hope this helps